CA2535264C - Recording medium, method of configuring control information thereof, recording and reproducing method using the same, and apparatus thereof - Google Patents

Abstract

In a recordable optical disc including at least one recording layer, write strategy information is recorded within disc control information, so that standardized disc control information can be uniformly applied to data recording and reproduction. At least one disc information is recorded as the disc control information within the management area. The disc control informations are recorded for at least one write strategy for a same writing speed and recording layer.

Description

Recording Medium, Method of Configuring Control Information Thereof, Recording and Reproducing Method Using the Same, and Apparatus Thereof Technical Field The present invention relates to recording media, and more particularly, to a method of recording control information on a recordable optical disc including at least one recording layer, in which write strategy information is included within the recorded control information, and to method of recording data using the disc control information recorded in a specific area of the recordable optical disc.

Background Art A high density optical recording medium, known as HD-DVD, is widely used to record and store high-definition video data and high-quality audio data. The Blu-ray disc represents next-generation HD-DVD technology.

Technological specifications are now being established for the global standardization of the Blu-ray disc, including standards are for the write-once Blu-ray disc,, (BD-WO). Meanwhile, a rewritable Blu-ray disc, known as the lx-speed BD-RE and now being discussed, should be compatible with BD-RE discs expected to have higher recording velocities, i.e., the 2x-speed BD-RE and beyond. BD-WO specifications for high recording velocity are also in progress.
Efficient solutions for coping with the high recording velocity of a high-density optical disc are urgently needed, and the specifications established should ensure mutual compatibility.
Disclosure of Invention Accordingly, the present invention is directed to a disc control information recording method that substantially obviates one or more problems due to limitations and disadvantages of the related art.

An object of the present invention is to provide a method of recording disc control information corresponding to high writing speed, by which write strategy information is included within disc control information prerecorded on a recording medium and by which recording on and reproducing from the recording medium can be performed based on recorded disc information.

Another object of the present invention is to provide a data structure for configuring disc control information.

Another object of the present invention is to provide a method of recording disc control information which includes write strategy information for coping with high writing speeds, to achieve compatibility between like-based recording media.

Another object of the present invention is to provide a recording medium, recording and reproducing method, and apparatus suitable for use with the above disc control information recording methods.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a data structure of a control information for use with a recording medium having at least one recording layer, wherein the control information including at least one information unit for a specific writing speed and recording layer, characterized in that the information unit includes write strategy parameters for first write strategy type to be used for the writing speed and recording layer, wherein the first write strategy type is one of a plurality of write strategy types applicable to the same writing speed and recording layer.

In another aspect of the present invention, an optical recording medium includes the control information by the data structure.

In another aspect of the present invention, a recording method includes the steps of reading at least one control information, the control information including at least one information unit for a specific writing speed and recording layer, characterized in that the information unit includes write strategy parameters for first write strategy type to be used for the writing speed and recording layer, wherein the first write strategy type is one of a plurality of write strategy types applicable to the same writing speed and recording layer; and recording data on a specific recording layer at a specific writing speed based on the at least one information unit.
In another aspect of the present invention, a recording method includes the steps of reading a control information, the control information including first information unit for a specific writing speed and recording layer, characterized in that the first information unit includes write strategy parameters for first write strategy type to be used for the writing speed and recording layer, wherein the first write strategy type is one of a plurality of write strategy types applicable to the same writing speed and recording layer, and second information unit for the same writing speed and recording layer includes write strategy parameters for second write strategy type different from the first write strategy type; and recording data on a specific recording layer at a specific writing speed based on at least one information unit.

In another aspect of the present invention, a recording method includes the steps of reading a control information, the control information including first information unit for a specific writing speed and recording layer, characterized in that the first information unit includes write strategy parameters for first write strategy type to be used for the writing speed and recording layer, wherein the first write strategy type is one of a plurality of write strategy types applicable to the same writing speed and recording layer, and an additional information unit for a higher writing speed and the same recording layer, and second information unit including write strategy parameters for the same write strategy type or a different write strategy type to be used for the higher writing speed and the same recording layer; and recording data on a specific recording layer at a specific writing speed based on at least one information unit.

In another aspect of the present invention, a recording apparatus includes a controller for generating a recording command; and a recorder/reproducer for performing a recording, based on the generated recording command, by reading a control information, the control information including at least one information unit for a specific writing speed and recording layer, characterized in that the information unit includes write strategy parameters for first write strategy type to be used for the writing speed and recording layer, wherein the first write strategy type is one of a plurality of write strategy types applicable to the same writing speed and recording layer.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Brief Description of Drawings The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:

FIG. 1 is a diagram of a single-layer disc applicable to the present invention;
FIG. 2 is a diagram of a dual-layer disc applicable to the present invention;

FIG. 3 is a diagram of a management area where disc control information of the present invention is recorded, illustrating a disc information recording format;

FIGS. 4A-4E are diagrams of a sample data structure of disc control information recorded according to a first embodiment of the present invention;

FIGS. 5A and 5B are diagrams of a sample data structure of disc control information recorded according to a second embodiment of the present invention;

FIG. 6, FIGS. 7A & 7B, and FIG. 8 are diagrams of a sample data structure of disc control information recorded according to a third embodiment of the present invention;

FIG. 9A-9E are diagrams of t sample data structure of disc control information recorded according to a fourth embodiment of the present invention; and FIG. 10 is a block diagram of an optical disc recording and reproducing apparatus according to the present invention.

Best Mode for Carrying Out the Invention Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. For convenience of explanation, a Blu-ray disc (BD) is taken as an example of an optical disc according to the present invention. Yet, it is apparent that the concept of the present invention, which is characterized in an optical disc having its disc control information recorded thereon, is applicable to DVD-RAM/-RW/+RW/-R/+R and the like for example in the same manner.

Besides, although terms used in the present invention are possibly selected from the currently well-known ones, some terms are arbitrarily chosen by the applicant in some cases so that their meanings are explained in detail in the following description. Hence, the present invention should be understood with the intended meanings of the corresponding terms chosen by the applicant instead of the simple names or meanings of the terms themselves.

First of all, `disc control information' in the description of the present invention means an area including various information for disc record playback or information for disc record playback. And, the disc control information is commonly designated information provided to a prerecorded area within a disc or to an embossed area for a disc user by a disc manufacturer.
Yet, the disc control information is provided not only to the prerecorded area but also to a recordable area. The disc information within the prerecorded or embossed area can be copied to the recordable area as well. And, they are just exemplary.

For instance, the disc control information is called `disc information' in BD
or `physical format information' in DVD-RAM/-RW/+RW/-R/+R. Hence, it is apparent that the technical background of the present invention is identically applicable to `physical format information' in DVD-RAM/-RW/+RW/-R/+R. For convenience of explanation, `disc information (hereinafter abbreviated DI)' corresponding to a case of Blu-ray disc (BD) is taken as an example.

FIG. 1 and FIG. 2 are structural diagrams of optical discs according to the present invention, in which a recordable optical disc is enough to be the optical disc applicable to the present invention. Moreover, the recordable disc can be any one of a rewritable optical disc, a write-once optical disc, and the like.

FIG. 1 is a structural diagram of a single-layer disc having one recording layer according to the present invention.

Referring to FIG. 1, a lead-in area is provided as a management area on an inner circumference area of an optical disc, whereas a lead-out area is provided as a management area on an outer circumference area of the optical disc. Specifically, a prerecorded area and a rewritable or write-once area are separated from each other within the inner circumference area of the disc.

The prerecorded area is an area (called `embossed area') where data was already written in manufacturing the disc, whereby a user or system is unable to perform data writing on the prerecorded area at all. In BD-RE/WO, the prerecorded area is named PIC
(permanent information and control data) area. And, the above-described disc information (hereinafter called `DI') as information required for disc recording is recorded in the PIC
area.

In a data area, provided are a user data area where user's real data is recorded and spare areas ISA and OSA to replace a generated defect area. Specifically, TDMA (temporary defect management area) for recording information of defect and general managements is provided to such a write-once optical disc as BD-WO. In case of the re-writable BD (BD-RE), TDMA
is unnecessary so that such an area is left as a reserved area.

The present invention intends to provide a method of efficiently recording disc information (DI) as disc control information required for record playback of a disc in the prerecorded or recordable area. It is apparent that a recording method in the prerecorded area is differently applied to each kind of discs. In case of BD-RE/WO, the PIC area as the prerecorded area is recorded by biphased high frequency modulated signals, the high frequency modulated signals in the corresponding area are played back according to a specific playback method, and information is acquired from the playback.

FIG. 2 is a diagram of a dual-layer disc having dual recording layers, in which a recording layer starting with a lead-in is named a first recording layer LayerO and a recording layer ending with a lead-out is named a second recording layer Layer 1.

In the dual-layer disc, the PIC area is provided to lead-in and lead-out areas of a disc inner circumference area, and disc information (DI) of the same contents is recorded in the PIC area.
FIG. 3 is a structural diagram of a PIC area in the disc shown in FIG. 1 or FIG. 2. As mentioned in the foregoing description, it means that information can be rearranged like the structure of the PIC area in Fig. 3 when the entire information within the high frequency modulated PIC area is acquired.

A method of configuring disc information (DI) in the PIC area is explained in detail as follows.

In BD-RE/WO, `one cluster' represents a minimum record unit, five hundred forty-four clusters gather to construct one fragment as one upper record unit, and total five fragments gather to form the PIC area. Disc information is recorded in a front head cluster of a first fragment IFO. The disc information is plurally recorded per recording layer and writing speed permitted by the corresponding optical disc, and one disc information includes one hundred twelve bytes. Specifically, disc information constructed with 112-bytes is called disc information (DI) frame. Moreover, the same contents of the disc information are repeatedly recorded in each front head cluster of the rest of the fragments, thereby enabling to cope with loss of the disc information.

Information representing the corresponding recording layer, information representing writing speed, and write strategy information corresponding to the writing speed are recorded within each disc information. Hence, such information is utilized in record playback of the corresponding optical disc, thereby enabling to provide optimal write power per recording layer and per writing speed.

Namely, the disc information (DI) of the present invention is characterized in providing specific writing speed information supported by the corresponding disc and associated write strategy information, and more specifically, in providing specific writing speed supported for each recording layer and associated write strategy information via a specified method in case that a plurality of recording layers exist in the corresponding disc.

And, the specific configuration of the disc information (DI) relates to that of Blu-ray disc (BD). It is also apparent that a DVD based disc may have a configuration different from the above-explained structure. Specifically, if a size of disc information (DI) corresponds to that of BD, it is 112bytes equivalently for example. Yet, by regarding disc information (DI) of the same recording layer as one information to provide once without repeating common information, it may be able to configure the write strategy differing per writing speed only in addition.

Various embodiments for a method of configuring disc information and a method of recording specific information and the like within disc information according to the present invention are explained in detail by referring to the attached drawings as follows.

FIGs. 4A to 4E are diagrams of recording disc information of an optical disc according to a first embodiment of the present invention, in which one of a plurality of write strategy (WS) types defined by a specification is recorded on a corresponding disc information.

FIG. 4A shows a concept of recording disc information of an optical disc according to a first embodiment of the present invention.

Referring to FIG. 4A, a plurality of disc informations are recorded within a disc, a record sequence of each disc information is decided by a sequence number, and the record sequence is recorded by 1-byte. For instance, the corresponding information is recorded in 5th byte within the disc information, which is named `DI frame sequence number in DI
block' field and is briefly indicated by `OOh, 0 lh, 02h, 03h ...'.

Namely, the information of the 5th byte is defined in a following manner.
First of all, if the information of the 5th byte is 'OOh', 'OOh' means 1St disc information as well as disc information of lx speed of a first recording layer LayerO. `Olh' means rd disc information as well as disc information of lx speed of a second recording layer Layerl. `02h' means 3rd disc information as well as disc information of 2x speed of the first recording layer LayerO. And, `03h' means 4th disc information as well as disc information of 2x speed of the second recording layer Layer 1.

Hence, the disc information is preferentially arranged in a recording velocity order and is then configured in a per recording layer order. Yet, this is just exemplary. On the contrary, the recording layer order can be preferred to the recording velocity order in configuring disc informations.

Moreover, write strategy (WS) interoperating with recording velocity meant by the corresponding disc information is recorded in a specific area, e.g., area named `Write Strategy parameters' field as Lth-111th bytes, within the disc information. And, identification information enabling to identify a type or kind of the recorded write strategy (WS) recorded in the Lth-111th bytes is recorded in another specific area, e.g., area named `Write Strategy type' field as Nth byte, within the disc information.

Considering the meaning of `write strategy (WS)', a medium property of a recording layer is generally modified by applying a laser beam to the recording layer within an optical disc via a pickup ('11' in FIG. 10) to perform a recording thereof. Hence, it should be decided a strength (write power) of the laser beam, write pulse, a time of applying the write power thereto, and the like. The above-decided various kinds of write strategies are named `Write Strategy (WS)' in general and specific contents recorded within a specific `Write Strategy (WS)' are named `Write Strategy (WS) parameters'.

Write strategy (WS) information used in the present invention means the entire information associated with write strategy (WS). And, WS parameters means items and specific numeric values configuring WS and is a sort of WS information. Hence, the WS
information has an inclusive concept of including the above-described 'WS Type', 'WS flag' that will be explained later, and the like as well as the WS parameters.

And, the write strategy (WS) can be recorded in various ways. As a disc becomes to be highly densified and to run at higher speed, a writing speed, i.e., disc RPM) as well as the medium property of the recording layer is considerably affected. Hence, a more accurate system is requested. And, the various write strategies (WS), i.e., WS types are explained as follows for example.

First of all, there is a system having a number of recording pulse smaller by 1 than a recording mark size (n) formed on a recording layer medium, which may be called `(n-1) WS'. For example, if a mark has a length 7T, it requires 6 pluses to form the 7T
according to the (n-1)WS. In that case, a time of each write pulse or a level of write power is defined by the write strategy parameters recorded in the corresponding disc information. Secondly, there is a system having a number of recording pulse having a size amounting to a half of the recording mark size (n), which may be called `n/2 WS'. For example, if a mark has a length 7T, it requires 3 pluses to form the 7T according to the (n-1)WS. That is, a decimal fraction of the result is discarded and the integer numbers of pluses are only available. In that case, a time of each write pulse or a level of write power is defined by the write strategy parameters recorded in the corresponding disc information. The respective write strategy parameters for each write strategy type may have different values each other. Besides, new write strategies (WS) keep being developed. Regarding the different kinds of write strategy (WS), when there exist the various systems of the write strategy (WS) exist as parameters applied to the write strategies (WS) differ from each other, a disc manufacturer tests the write power according to the write strategy (WS) and then records a result of the test in 'WS parameters' field of the Ls'-111th bytes within the disc information and WS type information in Nth byte.

If there exist N-types of write strategies (WS), the identification information allocates a specific recognition value to each write strategy (WS) to define as follows.
For instance, '0000 0001b' means 1st WS (Write Strategy-1 or WS-1). '0000 0010b' means 2d WS
(Write Strategy-2 or WS-2). 'XXXX XXXXb' means Nth WS (Write Strategy-N or WS-N).

In the present invention, l't WS (WS-1) is defined by the above-explained '(n-1) WS' and 2nd WS (WS-2) is defined by '(n/2) WS'.

Moreover, if the 'WS Type' field is set to '0000 0000b', it can be defined to mean that a specific WS type fails to exist as well as WS parameters within disc information. Namely, the 'WS Type' field of the Nth byte can be utilized as information indicating that there exists no WS parameters as well as information designating the WS type.

FIG. 4B shows an example of recording disc information for a specific write strategy (WS), in which a disc manufacturer selects to record lst WS (WS-1) from various specifications in recording a write strategy (WS) for lx speed within 1x speed disc information of a first recording layer.

Namely, if 'WS Type' field of Nth byte of disc information is '000 0001b' means 1st WS (WS-1), parameter values corresponding to the WS-1 are written in `Write Strategy parameters' field of Lth-l 11th bytes.

Hence, in case that a disc manufacturer selects to record 2nd WS (WS-2), `0000 0010b' is written in the `Write Strategy Type' field and parameters fitting the 2nd WS
will be written in the Lth-111 th bytes. The parameters written in the LthNl11th bytes have different values from each other according to the write strategy (WS) type. And, the corresponding write strategy (WS) parameters are previously determined as specified information fitting the characteristics of the disc and will be provided to a disc manufacturer or a system designer.

FIGs. 4C to 4E show specific embodiments for a method of recording the above-defined write strategy (WS) within disc information. FIG. 4C and FIG. 4D show the method that the write strategy (WS) is optionally selected to be recorded for the entire recording layers and recording velocities on manufacturing a disc. And, FIG. 4E shows a method of recording a previously determined write strategy (WS) in a mandatory manner in case of a specific recording velocity.

For convenience of explanation, it is assumed that a disc includes a dual layer and that lx speed (1X) and 2x speed (2X) are applied to each recording layer.

FIG. 4C shows a case of enabling to optionally different record write strategies (WS) in the entire recording layers and at the entire recording velocities. For instance, disc information of lx speed of a first recording layer LayerO is recorded in 'OOh' as a disc information sequence and 1St WS (WS-1) is selected to be recorded as a write strategy (WS). Disc information of lx speed of a second recording layer Layerl is recorded in `Olh' and 2nd WS (WS-2) is selected to be recorded as a write strategy (WS). Disc information of 2x speed of the first recording layer LayerO is recorded in `02h' and 1" WS (WS-1) is selected to be recorded as a write strategy (WS). And, disc information of 2x speed of the second recording layer Layerl is recorded in `03h' and Nth WS (WS-N) is selected to be recorded as a write strategy (WS). In such a case, write strategy parameters for 1St WS (WS-1), e.g., (n-1) write strategy type, to be used for 1X speed of a first recording layer (Layer 0) may have different values from that to be used for 2X speed of the a first recording layer (Layer 0).

FIG. 4D shows another example of enabling to optionally record a write strategy (WS), in which the same type of write strategy (WS) is applied to disc information of the entire recording layers and recording velocities. In such a case, write strategy parameters for specific recording layer and/or writing speed may have different values from that for other recording layer and/or writing speed respectively.

Namely, since it is able to record a write strategy optionally, a disc manufacturer enables to apply one most reliable write strategy (WS) to the entire disc information identically. And, FIG. 4D illustrates a case that 1St WS (WS-1) is recorded in the entire disc information.

FIG. 4E shows a method of recording a write strategy (WS) previously determined in a mandatory manner in case of a specific recording velocity or a write strategy (WS) optionally in case of a rest recording velocity. Generally, write strategy (WS) for lx speed is the most important write strategy of which specific method is previously decided by a specified decision and a disc manufacturer enables to optionally record the rest recording velocities except the lx speed. Yet, in case of a high-speed disc, it is apparent that the recording velocity decided in a mandatory manner can be 2x speed, 3x speed, or the like as well as lx speed.

For instance, if a type of a write strategy (WS) mandatory for the lx speed is 1St WS (WS-1), disc information for lx speed of a first recording layer is written in 'OOh' and `Olh' as a disc information sequence and the 1st WS (WS-1) should be written as the write strategy (WS) in a mandatory manner. Disc information for 2x speed of the first recording layer is written in `02h' and `03h' and 2"d WS (WS-2) is selected to be recorded as the write strategy (WS) that can be optionally recorded. Hence, if the write strategy (WS) type mandatory for lx speed is the 2n' WS (WS-2), it is apparent that the 2nd WS (WS-2) should be recorded in a mandatory manner as well as 'OOh' and `Olh' as the disc information sequence record the disc information of lx speed therein.

In applying the case of FIG. 4E, one of a plurality of specified write strategies is uniformly written as the lx speed write strategy (WS) in a mandatory manner, thereby enabling to secure more disc recording characteristics. And, a disc manufacturer enables to optionally record one of a plurality of the specified write strategies uniformly for the rest recording velocities except the lx speed, whereby a disc manufacturing process time can be shortened.
Besides, in specific case of FIG. 4E, it is also able to record the mandatory write strategy (WS) for lx speed as well as a disc manufacturer enables to optionally record other write strategy (WS) for lx speed separately. In such a case, the disc information for lx speed can include disc information including the specified mandatory write strategy (WS) and different disc information including the optional write strategy (WS). This will be explained in the description of a third embodiment of the present invention in detail later.

FIGs. 5A to 5C are diagrams of an another example of recording disc information according to a second embodiment of the present invention, in which `applicable writing speed information' and `recording layer information existing within disc' are recorded within the corresponding disc information as well as one of a plurality types of write strategies (WS) defined by a specification.

Referring to FIG. 5A, `DI frame sequence number in DI block' is provided to 5th byte of each disc information to mean a sequence, which means that disc informations are configured in a specific, sequence in the same manner of FIG. 4A. And, `Write Strategy Type (WS)' field is provided to a specific area (Nth byte) within disc information to record a type of WS applied to the corresponding disc information.

Besides, writing speed information applicable by a corresponding disc is recorded within a specific area (Mth byte) within disc information, which is named `Writing speed flag' field.

For instance, whether a specific writing speed of eight kinds of writing speeds is applicable by the corresponding disc is represented by 1-bit each in the same area having 1-byte allocated thereto. Namely, it can be defined that the corresponding writing speed is not applicable (supported) if a bit value is `Ob' in entire bits or that the corresponding writing speed is applicable (supported) if the bit value is `ib'. Hence, each of the bits b0-b7 within 1-byte becomes flag information indicating presence or non-presence of applicability of a specific writing speed.

For instance, if lx speed is applicable by a corresponding disc only, `0000 0001' is written in Nth byte. If all of the eight kinds of writing speeds are applicable, `1111 1111' is written in the Nth byte.

In the above explanation, 1x and 2x speeds utilized by every disc almost are previously decided to be adopted. Yet, writing speeds decided by specification can be used as the rest writing speeds from 3rd writing speed. For instance, it is possible to set 3rd, 4th, 5th, 6th, 7th, and 8th writing speeds (3rd X, 4th X, 5th X, 6th X, 7th X, 8th X) to 5x, 6x, 8x, 12x, 14x, and 16x speeds, respectively.

Meanwhile, recording layer information indicating the number of recording layer(s) existing within the corresponding disc is recorded in another specific area (Lth byte) within the disc information, which is named `Number of Recording Layer' field. For instance, a value meaning the number of the recording layer(s) can be represented by a binary number in the same area having 1-byte allocated thereto. In case that the recording layer is the single layer in FIG. 1, `0000 0001' is written in the Lth byte. In case that the recording layer is the dual layer in FIG. 2, `0000 0010' is written in the Lth byte. In case that four recording layers exist, `0000 0100' is written in the Lth byte.

Since limitation is put on the number of the currently considered recording layer(s), which is currently two recording layers, 4-bits within the Lth byte are enough to represent total fifteen recording layers (in case of `1111'). In such a case, it is apparent that other valid information can be written in the rest area (4-bits) of the Lth byte.

Moreover, a specific `Write Strategy (WS) parameters' field interoperating with a `Write Strategy (WS) Type' field value of the Nth byte is provided to another specific area (Pth,l l lth bytes) to record associated information therein.

Thus, from the above-recorded `writing speed information' in the Mth byte and the `recording layer information' in the Lth byte, a record playback apparatus (FIG. 9) recognizes how many disc informations exist within the corresponding disc. Namely, the number of the existing disc informations is found by multiplying an applicable writing speed number by the number of recording layers.

As the present invention applies one write strategy (WS) to a specific writing speed and a specific recording layer, the kind (type) and number of the write strategy (WS) may not be taken into consideration in deciding the number of disc information(s). Yet, in a third embodiment of the present invention (FIG. 6-FIG. 8), it will be described that a plurality of write strategies (WS) can exist for a specific writing speed and a specific recording layer. In such a case, the total number of the existing disc informations is not always found by multiplying an applicable writing speed number by the number of recording layers. This will be explained in detail later in FIG. 6.

Hence, a sequence of a plurality of the above-decided disc informations is decided by the sequence numbers, which is written in the 5th byte in the foregoing description, and each of the disc informations designates the previously decided writing speed and recording layer by the sequence.

For example, by knowing that four writing speeds applicable by a disc exist if the Nth byte is `0000 1111' and that two recording layers exist within the disc if the Lth byte is `0000 0010', total eight disc informations are needed so that the sequence will be `OOhh07h'. And, it is previously decided that disc informations of `OOh', `Olh', `02h', `03h', `04h', `05h', `06h', and `07h' relate to `lx speed, 1St recording layer', `lx speed, 2nd recording layer', `2x speed, 1St recording layer', `2x speed, 2nd recording layer', `3rd writing speed, 1St recording layer', `3rd writing speed, 2nd recording layer', `4th writing speed, 1St recording layer', and `4th writing speed, 2nd recording layer'.

Hence, in order to acquire the disc information for a specific target writing speed and a specific target recording layer, the record playback apparatus (FIG. 10) is facilitated to check which disc information is related to the specific target writing speed and recording layer from `writing speed information' of the Nth byte and `recording layer information' of the Lth byte commonly recorded within the respective disc informations instead of playing back to check the entire disc informations.

FIG. 5B shows an example of recording disc information according to the second embodiment of the present invention in FIG. 5A. It can be known that there are two (1X, 2X) applicable writing speeds from Mth byte ('0000 0011b') commonly recorded in the entire disc informations and that two recording layers exist within a disc from Lth byte ('0000 001Ob').
Hence, in the example of FIG. 5B, total four disc informations (two recording layers * two writing speeds) exist and a sequence of the disc informations becomes 'OOh' (1X,L0) - `Olh' (1X,L1) 4 `02h' (2X,L0) - `03h' (2X,L1). This is done by a specified content according to a predetermined sequence. Thus, the entire disc informations should be configured according to the above manner to enable reciprocal compatibility for utilization.

An intrinsic write strategy (WS) is recorded within each disc information.
Specifically, information of a type of a write strategy (WS) written in Pth-111th bytes within the corresponding disc information is recorded in Nth byte. Namely, informations in the Nth and Pth-111th bytes can differ in each disc information, which means that a disc manufacturer enables to optionally record one of a plurality of WSs.

In the example in FIG. 5B, 'OOh' (1X,L0) and `Olh' (1X,Ll) relate to the application of a first type write strategy (WS-1) and `02h' (2X,L0) and `03h' (2X,Ll) relate to the application of a second type write strategy (WS-2).

FIG. 5C shows another example of recording disc information according to the second embodiment of the present invention in FIG. 5A. It can be known that there are eight (lX, 2X, 16X) applicable writing speeds f r o m Mth byte (` l 111 111 lb') commonly recorded in the entire disc informations and that four recording layers exist within a disc from Lth byte ('0000 0100b').

Hence, in the another example of FIG. 5C, total thirty-two disc informations (four recording layers * eight writing speeds) exist and a sequence of the disc informations becomes `OOh' (1X,L0) 4 `Olh' (1X,L1) - `02h' (1X,L2) - `03h' (1X,L4) - `04h' (2X,L0) - ... -*
`31h' (16X,L4). This is done by a specified content according to a predetermined sequence.
Thus, the entire disc informations should be configured according to the above manner to enable reciprocal compatibility for utilization.

In the another example of FIG. 5C, if a record playback unit (FIG. 10) intends to search disc information related to 2x speed (2X,L0) of a first recording layer to perform recording by applying a write strategy (WS) within the corresponding disc information, it can be known from the informations in the Mth and Lth bytes commonly recorded in the entire disc informations that total thirty-two disc informations (four recording layers *
eight writing speeds) exist in the corresponding disc according to the sequence of the disc informations such as `OOh' (1X,L0) - `Olh' (1X,Ll) - `02h' (1X,L2) - `03h' (1X,L4) 3 `04h' (2X,L0) -3 ... - `31h' (16X,L4). Hence, the record playback apparatus (FIG. 9) enables to recognize that the disc information related to the 2x speed (2X,L0) of the first recording layer to be searched is `04h' and that the corresponding disc information ('04h') is recorded as the first type write strategy (WS-1) from the write strategy (WS) type identification information ('0000 0001b') recorded in the Nth byte within the corresponding information ('04h'), thereby reading out parameter values of the first type write strategy (WS- 1) via the Pth,11 lth bytes to utilize in the recording.

Likewise, if intending to search disc information related to 16x speed (16X,L3) of a fourth recording layer to perform recording by applying a write strategy (WS) within the corresponding disc information, the record playback unit (FIG. 9) recognizes that the corresponding disc information is `31h' via the same process and that the write strategy type (WS) is the second type (WS-2), thereby enabling to utilize them in the recording.

FIGs. 6 to 8 shows a method of recording disc information of an optical disc according to a third embodiment of the present invention. The second embodiment of the present invention is characterized in that at least one write strategy (WS) is configured for a same writing speed/recording layer. Namely, a plurality of disc informations associated with the same writing speed/recording layer can exist to be classified by WS types, respectively.

FIG. 6 shows a concept of the method of recording disc information of the optical disc according to the third embodiment of the present invention.

Referring to FIG. 6, a sequence for disc information each is decided by a sequence number and is recorded by 1-byte.

For instance, the information is recorded in 5th byte within disc information, is named `DI
frame sequence number in DI block', and is briefly represented by `OOh, Olh, 02h, ...'.
Namely, if the information of the 5th byte is 'OOh', it means 1St disc information. If the information of the 5th byte is `07h', it means 8th disc information.

In configuring disc information, the present invention is characterized in that disc information is separately provided per writing speed, per recording layer, and per write strategy (WS) and that a configuration sequence of a plurality of the separately provided disc informations is uniformly decided according to a predetermined manner.

For instance, if a corresponding optical disc includes a pair of recoding layers and a plurality of WS types exist, disc informations can be configured in a following manner.

`OOh' of 1St disc information is related to lx speed, 1St recording layer L0, and WS1. `Olh' of 2d disc information is related to lx speed, 1St recording layer L0, and WS2.
`02h' of 3rd disc information is related to lx speed, 2d recording layer L1, and WS1. `03h' of 4th disc information is related to lx speed, 2nd recording layer L1, and WS2. `04h' of 5th disc information is related to 2x speed, lst recording layer L0, and WS1. `05h' of 6th disc information is related to 2x speed and 1St recording layer L0, and WS3. `06h' of 7th disc information is related to 2x speed, 2nd recording layer L1, and WS1. And, `07h' of 8th disc information is related to 2x speed, 2nd recording layer Ll, and WS3.

Namely, in configuring disc informations, the third embodiment according to the present invention is characterized in that at least one disc information is configured per writing speed, the respective per writing speed disc informations are reconfigured per recording layer, and at least one WS type is provided to each recording layer.

Hence, in configuring disc informations for the same writing speed/recording layer, it is able to configure a plurality of disc informations according to WS types.

FIG. 7A exemplarily shows a method of configuring disc information according the third embodiment of the present invention in FIG. 6.

Referring to FIG. 7A, `DI frame sequence number in DI block' is provided to 5th byte of each disc information to mean a sequence, which means that disc informations are configured in a specific order (writing speed - recording layer - WS type) of priority in FIG.
6.

And, `Write Strategy (WS) Type' field (N t'' byte), `Writing speed flag' field (Mth byte), `Number of Recording Layer' field (Lth byte), and `Write Strategy (WS) parameters' field (Pth.l I Ph bytes) are recorded in Nth Mth, Lth and Pth-l 11th bytes, respectively. Meaning of each information recorded in the fields is the same of that of the second embodiment (FIG.
5A).

In FIG. 7A, `Writing speed flag = 0000 0111b' of Mth byte means that three kinds of writing speeds are applicable. And, `Number of Recording layer = 0000 001 Ob' of Lth byte means two recording layers exist.

Moreover, information informing a write strategy (WS) type applicable by a corresponding disc via specification is recorded in another specific area (Kth byte) within disc information, which is named `Write Strategy (WS) flag' field. For instance, whether a specific write strategy (WS) of eight kinds of write strategy (WS) types is applicable by the corresponding disc is represented by 1-bit each in the same area having 1-byte allocated thereto. Namely, it can be defined that the corresponding write strategy (WS) is not applicable (supported) if a bit value is `Ob' in entire bits or that the corresponding write strategy (WS) is applicable (supported) if the bit value is `lb'. Hence, each of the bits b0-b7 within 1-byte becomes flag information indicating presence or non-presence of applicability of a specific write strategy (WS) type. For instance, if 1" to 3rd write strategy (WS) types WS1 to WS3 are applicable by a corresponding disc only, `0000 0111b' is written in Lth byte. If all of the eight kinds of write strategy (WS) types WS1 to WS8 are applicable, `1111 111 lb' is written in the Lth byte. In FIG. 7A, `0000 111 lb' is written in the Kth byte to allow four write strategy (WS) types WSl to WS4.

By writing the Mth, Lth, and Kth byte informations recorded within the disc information by the same values in common to the entire disc informations, respectively, the record playback apparatus (FIG. 10) is facilitated to acquire the informations of the writing speed applicable by the corresponding disc, the write strategy (WS) type, and the number of the recording layers despite playing back any disc information.

Specifically, it may be able to record all kinds of the write strategy (WS) types applicable by specifications in configuring the disc informations. Yet, in such a case, the number of the recorded disc informations excessively increases. Moreover, a disc.
manufacturer should test the entire write strategy (WS) types and record the test results within the disc information, whereby it becomes a burden.

Therefore, in the embodiment according to the present invention, write strategies (WS) of which number (m) is smaller than that (n) of the maximum applicable write strategy types are recordable per writing speed within disc information and a disc manufacturer further enables to optionally record a specific one of a plurality of write strategies (WS), whereby disc manufacturer's convenience is secured as well as an efficient recording of disc information is enabled.

In FIG. 7A, recording is performed at lx speed (1X) using 1St and 2nd type write strategies WS1 and WS2, at 2x speed (2X) using 2 d and 3rd type write strategies WS2 and WS3, or at 3rd writing speed (3X) using 3rd and 4th type write strategies WS3 and WS4.

Namely, it is able to record disc information using write strategy (WS) types (two types) less than total applicable write strategy (WS) types (four types) per writing speed. And, it is able to confirm or verify the intrinsic write strategy (WS) applied to each disc information via `Write Strategy (WSO Type' field (Nth byte) and `Write Strategy (WS) parameters' field (Pth-111 th bytes).

FIG. 7B shows another example of recording disc information according to the third embodiment of the present invention in FIG. 6. Like FIG. 7A, three kinds of applicable writing speeds exist and `0000 Olllb' is written in Mth byte. Four applicable write strategy types exist and `0000 111 lb' is written in Kth byte. And, two recording layers exist within a disc and `0000 0010b' is written in Lth byte.

Referring to FIG. 7B, in configuring disc informations using one of a plurality of applicable write strategies (WS), at least one disc information is configured per the same writing speed and recording layer. In doing so, the most preferentially provided disc information is defined as a preferred WS provided by a disc manufacturer and another disc information following the preferred WS is defined as an alternative WS.

Namely, both disc information 'OOh' and disc information `Olh' relate to lx speed (1X) and 1St recording layer (LO). Yet, the WS1 type recorded in 'OOh' as preferentially provided disc information becomes the preferred WS and the WS1 type information recorded in `Olh' as a next provided one becomes the alternative WS.

And, disc information `04h', disc information `05h', and disc information `06h' relate to 2x speed (2X) and 1St recording layer (LO). Yet, the WS2 type information recorded in `04h' as preferentially provided disc information becomes the preferred WS, and the WS
1 type information recorded in `05h' and the WS3 type information recorded in `06h' as next provided ones become the alternative WSs, respectively. Namely, they can be applied to at least three disc informations of the same writing speed/recording layer.

Moreover, disc information '10h' relates to 3rd speed (3d X) and 1St recording layer (LO) and disc information `1lh' relates to 3rd speed (3rd X) and 2nd recording layer (LO). In case that only one WS type information is provided to the same writing speed/recording layer, the provided WS becomes the preferred WS.

Namely, when a disc manufacturer provides disc information within a disc according to the previously determined specification, an optical record playback apparatus (FIG. 9) reads out the disc information in a specific order (writing speed - recording layer). If a plurality of disc informations exist on the same writing speed/recording layer, the optical record playback apparatus (FIG. 10) recognizes the preferentially provided WS within the disc information as the preferred WS and the next WS as the alternative WS additionally provided by a disc manufacturer, thereby enabling record playback using disc information efficiently.

Even if both of the preferred WS and the alternative WS are `optional WS' a disc manufacturer enables to select optionally, it may be possible to render the preferred WS into `mandatory WS' and the alternative WS into `optional WS' only.

FIG. 8 shows another example of recording disc information according to the third embodiment of the present invention in FIG. 6, in which a disc manufacturer directly provides information of a most preferred write strategy (WS) type at a specific writing speed.

Referring to FIG. 8, `Write Strategy (WS) Type' field (Nth byte), `Writing speed flag' field (Mth byte), `Write Strategy (WS) flag' field (Kth byte), `Number of Recording Layer' field (Lth byte), and `Write Strategy (WS) parameters' field (Pth-111th bytes) are recorded in Nth, Mth, Kth, Lth, and Ph-111.th bytes, respectively. Meaning of each information recorded in the fields is the same of that of the second embodiment (FIG. 7B).

And, `Best WS flag in Writing speed' field is provided to another specific area (Qth byte) within disc information, whereby a disc manufacturer provides information of a WS
indicating a best quality among a plurality of write strategies (WS) existing per same writing speed. For example, FIG. 8 shows that 2d WS (WS2) is the `Best WS' of eight applicable WSs at a specific writing speed.

In case that a plurality of WSs enable to exist for the same writing speed/recording layer like FIG. 7A, an optical record playback apparatus (FIG. 10) is unable to distinguish which is the most appropriate WS for a corresponding writing speed. Hence, the optical record play back apparatus computes the optimal WS by applying the entire WSs provided to the disc information. Yet, by providing the `Best WS flag in Writing speed' field to the Qth byte, it is able to apply to utilize the WS recorded in the Qth byte preferentially.

In case that a plurality of WSs exist for the same writing speed/recording layer like FIG. 7B, it is able to recognize the WS recorded in 1St disc information as the preferred WS by a previously specified decided method. Yet, by providing the `Best WS flag in Writing speed' field to the Qth byte, it is able to reconfirm the preferred WS as well.
Moreover, in case that the preferred WS recorded in the 1" disc information for the same writing speed/recording layer is different from the `Best WS flag in Writing speed' information of the Qth byte, e.g., if the preferred WS is `mandatory WS' decided in a mandatory manner, a priority is given to the information of the Qth byte provided by a disc manufacturer, thereby enabling to provide the information more efficiently in deciding the optimal WS at the same writing speed.

FIG. 9A to 9E are a diagram of recording control information according to the fourth embodiment of the present invention. The recording control information is dependent on a recording method, e.g., CLV mode or CAV mode, in which information for identifying a type of disc information, e.g., CLV mode or CAV mode is recorded within disc information with another information enabling to identify a type of write strategy (WS) finally used.

Referring to FIG. 9A, the information enabling to identify a write strategy (WS) type is to identify which one of a plurality of specified write strategies (WS) was selected to be used by a disc manufacturer, whereas the information for identifying a disc information type enables to identify whether corresponding disc information is in CLV mode or CAV mode.
For instance, as mentioned in the foregoing description, various write strategy types, which can exist such as (n-1) WS, n/2 WS, etc., are defined as 1St WS WS-1, 2na WS WS-2, and Kt" WS
WS-K. And, the information identifying the write strategy type (named 'WS
Type') selected by a disc manufacturer is recorded within disc information.

FIG. 9B is a diagram of recording a write strategy within control information according to the fourth embodiment of the present invention in FIG. 9A, and FIG. 9C is a diagram of another example of recording a write strategy within control information according to the fourth embodiment of the present invention in FIG. 9A.

FIG. 9B shows that a disc manufacturer optionally records a specific write strategy (WS) for entire writing speeds in recording one of a plurality of write strategies (WS).

Referring to FIG. 9B, Nth byte of disc information indicates a disc information type, Pth byte of disc information indicates a write strategy (WS) type, and parameters associated with one write strategy (WS) decided by interworking with the Nth and Pth bytes are recorded in Lth-l Ith bytes.

For instance, disc information for 1x speed of 1St recording layer is recorded in `OOh' as a disc information sequence, a disc information type means a CAV mode, a write strategy (WS) type means 1St WS WS-1, and a write strategy (WS) interworks with them so that a CAV WS-1 is selected to be recorded. Disc information for 2x speed of lst recording layer is recorded in `Olh', a disc information type means a CLV mode, a write strategy (WS) type means 1St WS
WS-1, and a write strategy (WS) interworks with them so that a CLV WS-1 is selected to be recorded. Disc information for 4x speed of 1St recording layer is recorded in `02h', a disc information type means a CLV mode, a write strategy (WS) type means 2nd WS WS-2, and a write strategy (WS) interworks with them so that a CLV WS-2 is selected to be recorded.

Disc information for 8x speed of 1st recording layer is recorded in `03h', a disc information type means a CAV mode, a write strategy (WS) type means 2d WS WS-2, and a write strategy (WS) interworks with them so that a CAV WS-2 is selected to be recorded.

FIG. 9C shows that one of a plurality of write strategies (WS) is recorded within disc information, in which a mandatory write strategy (WS) type is recorded for a specific specified writing speed (e.g., lx speed) but a disc manufacturer optionally records a specific write strategy (WS) for the rest writing speeds.

Hence, the method in FIG. 9C differs from the method in FIG. 9B in that a write strategy (WS) type is decided in a mandatory manner by putting limitation on disc manufacturer's options for a specific writing speed (lx speed). This enables a manufacturer of a disc recording/reproducing apparatus (FIG. 10) to design to manufacture inexpensive products coping with one write strategy (WS) type only.

For instance, disc information for lx speed of lst recording layer is recorded in `OOh' as a disc information sequence, a disc information type means a CAV mode, a write strategy (WS) type means lst WS WS-1, and a write strategy (WS) interworks with them so that a CAV WS-1 is selected in a mandatory manner to be recorded. Disc information for 2x speed of 1st recording layer is recorded in `Olh', a disc information type means a CLV mode, a write strategy (WS) type means 1st WS WS-1, and a write strategy (WS) interworks with them so that a CLV WS-1 is selected to be recorded. Disc information for 4x speed of 1st recording layer is recorded in `02h', a disc information type means a CLV mode, a write strategy (WS) type means 2na WS
WS-2, and a write strategy (WS) interworks with them so that a CLV WS-2 is selected to be recorded. Disc information for 8x speed of 1st recording layer is recorded in `03h', a disc information type means a CAV mode, a write strategy (WS) type means 2õd WS WS-2, and a write strategy (WS) interworks with them so that a CAV WS-2 is selected to be recorded.
FIG. 9D shows another example of recording control information according to the fourth embodiment of the present invention, in which specific identification for CAV
mode is subdivided to be applied to `DI Type' field written in Nth byte within disc information and in which information designating a write strategy (WS) type is recorded as well.

Referring to FIG. 9D, in case that corresponding disc information means CAV
mode, this is subdivided to identify how many velocities are provided by a write strategy (WS). Hence, `DI
Type' field can be defined as follows. If `DI Type' field recorded in Nth byte is `0000 0001b', it means CAV mode and a write strategy (WS) recorded in Lth-111th bytes is recorded to correspond to one kind of velocity only. If `DI Type' field recorded in Nth byte is `0000 0010b', it means CAV mode and a write strategy (WS) recorded in Lth-111th bytes is recorded to correspond to two kinds of velocities. If `DI Type' field recorded in Nth byte is `0000 0011b', it means CAV mode and a write strategy (WS) recorded in Lth.111 th bytes is recorded to correspond to three kinds of velocities.

Moreover, `Write Strategy (WS) Type' field is added to Pth byte within disc information so that Lth-111th write strategy (WS) is recorded by interworking with a disc information type in Nth byte and a write strategy (WS) type in Pth byte. Namely, it can be defined as follows. If `0000 0000b' is written in Pth byte, it means 1" WS WS-1. If `0000 0010b' is written in Pth byte, it means 2d WS WS-2. And, if `XXXX XXXXb' is written in Pth byte, it means Kth WS
WS-K.

FIG. 9E is a diagram of recording a write strategy within control information comparable to FIG. 9D.

Referring to FIG. 9E, `0000 0000b' is written in `DI Type' field of Nth byte to mean CLV
mode. `0000 0001b' is written in `Write Strategy (WS) Type' field of Pth byte to mean 1St WS
WS-1. 5th byte is 'OOh' to mean' lx speed disc information of 1St recording layer. And, a specific write strategy (WS) interworking with the Nth and Pth bytes is written in Lth-l 11th bytes within a disc.

As it is a CLV mode, a write strategy (WS) for one kind of velocity is recorded. As it is 1st WS WS-1, parameters by `(n-1) WS' type are defined for example. Accordingly, a disc manufacturer records an optimal value in a corresponding disc.

If `DI Type' field (Nth byte) is set to `0000 000lb' to mean a CAV mode, or if `Write Strategy (WS) Type' field is set to `0000 0010b' to mean 2' WS WS-2, it is apparent that write strategy (WS) parameters written in Lth,lllth bytes should be recorded as new contents different from the parameters specified in FIG. 9E or the values of the corresponding parameters.

FIG. 10 is a block diagram of an optical disc record playback according to the present invention.

Referring to FIG. 10, a record playback apparatus according to the present invention includes a record playback unit 10 carrying out record playback on an optical disc and a control unit 20 controlling the record playback unit 10.

Industrial Applicability The control unit 20 gives a record or playback command for a specific area, and the record playback unit 10 caries out the record/playback for the specific area according to the command of the control unit 20. Specifically, the record playback unit 10 includes an interface unit 12 performing communications with an external device, a pickup unit 11 directly recording data on the optical disc or playing back the data, a data processor 13 receiving a playback signal from the pickup unit 11 to restore into a necessary signal value or modulating to deliver a signal to be recorded into a signal to be recorded on the optical disc, a servo unit 14 reading out a signal from the optical disc correctly or controlling the pickup unit 11 to record a signal on the optical disc correctly, a memory 15 temporarily storing disc control information including disc control information, and a microcomputer 16 responsible for controlling the above-described elements within the record playback unit 10.

A recording process of an optical disc according to the present invention is explained in detail as follows.

First of all, once an optical disc is loaded in the optical record playback apparatus, the entire disc management information within the disc is read out to be temporarily stored in the memory 15 of the record playback unit 10. Also, a specific disc management information only can be read from the optical disc. And, various kinds of the disc management information are utilized for the record/playback of the optical disc. Specifically, the management information stored in the memory 15 includes disc control information of the present invention. Hence, the recording layer information, writing speed information, and write strategy fitting the corresponding writing speed recorded within the disc information are read out to be stored in the memory.

If intending to perform a recording on a specific area within the optical disc, the control unit 20 renders such an intent into a writing command and then delivers it to the record playback unit 10 together with data for writing location information to be recorded.
After receiving the writing command, the microcomputer 16 decides or selects the corresponding writing speed to be applied to an intended recording layer within the optical disc from the management informations stored in the memory 15 and then performs the writing command using a (pre-)determined or selected write strategy type and the write strategy parameters applicable to the decided or selected writing speed.

Specifically, in case that the recording is performed on the optical disc by the present invention, the disc information as management information is provided in a specific order and the microcomputer 16 recognizes which WS is the preferred WS of the disc manufacturer in the same writing speed/recording layer. Therefore, it is more facilitated to perform the recording on a specific recoding layer within an optical disc at a specific writing speed.
Accordingly, the present invention provides various methods of providing disc control information coping with higher writing speed in a high-density optical disc, thereby enabling to uniformly apply the standardized disc control information to efficiently cope with the record/playback of the optical disc.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Thus, it is intended that the present invention covers the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims (40)

1. A data structure of a control information for use with a recording medium having at least one recording layer, the control information including at least first and second information units for a writing speed and recording layer, wherein the first information unit includes write strategy parameters for first write strategy type to be used for the writing speed and recording layer, and the second information unit includes write strategy parameters for a second write strategy type to be used for the same writing speed and recording layer, wherein the first write strategy type is one of a plurality of write strategy types applicable to the same writing speed and recording layer, and wherein each of the information units includes identification information for indicating that the corresponding write strategy type is an n-1 write strategy type or an n/2 write strategy type, where the n is a length of mark and each of the n-1 and n/2 represents the number of write pulses for forming a mark in the recording medium.

2. The data structure as claimed in claim 1, wherein at least one of the first and second information units is utilized for controlling a recording operation when data is recorded on the recording medium.

3. The data structure as claimed in claim 1 or 2, wherein the recording medium is writable blu-ray disc.

4. The data structure as claimed in any one of claims 1 to 3, wherein the identification information in the first information unit indicates the n-1 write strategy type and the identification information in the second information unit indicates an n/2 write strategy type.

5. The data structure of any one of claims 1 to 3, wherein the control information includes the alternative information unit for the same writing speed and recording layer, the alternative information unit including write strategy parameters for second write strategy type different from the first write strategy type.

6. The data structure as claimed in claim 5, wherein the second write strategy type is an n-1 write strategy type or an n/2 write strategy type, where n is a length of mark and each type represents a number of write pulse to form a corresponding mark.

7. The data structure as claimed in claim 5, wherein the first write strategy type is an n-1 write strategy type or an n/2 write strategy type, and the second write strategy type is an n-1 write strategy type or an n/2 write strategy type which is different from the first write strategy type, where n is a length of mark and each type represents a number of write pulse to form a corresponding mark.

8. The data structure as claimed in any one of claims 1 to 7, wherein each of the information units further includes applicable type information identifying an applicable write strategy type.

9. The data structure as claimed in any one of claims 1 to 8, wherein each of the information units further includes best type information identifying a best write strategy type at a specific writing speed.

10. The data structure as claimed in any one of claims 1 to 9, wherein each of the information units includes a recording layer number information and applicable writing speed information of the corresponding information unit, the recording layer number information indicating the number of the corresponding recording layer, and the applicable writing speed information indicating a writing speed applicable to the corresponding recording layer.

11. The data structure as claimed in any one of claims 1 to 10, wherein the control information further includes an additional information unit for a higher writing speed and the same recording layer, the additional information unit includes write strategy parameters for the first write strategy type or a different write strategy type to be used for the higher writing speed and the same recording layer.

12. The data structure as claimed in claim 11, wherein the write strategy parameters for the higher writing speed and the same recording layer are different from the write strategy parameters for the writing speed even if the same write strategy type is used.

13. The data structure as claimed in claim 11 or 12, wherein the additional information unit includes an identification information identifying the write strategy type.

14. The data structure as claimed in claim 13, wherein the identification information of the additional information unit identifies one of an n-1 write strategy type and an n/2 write strategy type, where n is a length of mark and each type represents a number of write pulse to form a corresponding mark.

15. The data structure as claimed in any one of claims 11 to 14, wherein the control information further includes an alternative information unit for the higher writing speed and recording layer of the additional information unit, the alternative information unit having write strategy parameters for an alternative write strategy type that is different from the write strategy type of the additional information unit.

16. The data structure as claimed in claim 15, wherein the alternative write strategy type is an n-1 write strategy type or an n/2 write strategy type, where n is a length of mark and each type represents a number of write pulse to form a corresponding mark.

17. The data structure as claimed in claim 15, wherein the write strategy type of the additional information unit for the higher writing speed and the recording layer is one of an n-1 write strategy type and an n/2 write strategy type, and the alternative write strategy type is one of an n-1 write strategy type and an n/2 write strategy type, which is different from a previous write strategy type, where n is a length of mark and each type represents a number of write pulse to form a corresponding mark.

18. A recording method comprising steps of:

reading at least one control information, the control information including at least a first information unit for a writing speed and a first recording layer and a second information unit for the same writing speed and a second recording layer, from a recording medium, wherein the first information unit includes write strategy parameters for first write strategy type to be used for the writing speed and the first recording layer, and the second information unit includes write strategy parameters for a second write strategy type to be used for the same writing speed and the second recording layer; and recording data at a specific writing speed based on the at least one of the first and second information units.

19. The method as claimed in claim 18, further comprising:

identifying at least one of the first and second information units based on an identification information; and recording data using the write strategy parameters included in the identified information unit.

20. The method as claimed in claim 19, wherein the identification information identifies one of an n-1 write strategy type and an n/2 write strategy type, where n is a length of mark and each type represents a number of write pulse to form a corresponding mark.

21. A recording method comprising steps of:

reading a control information, the control information including first and second information units for a writing speed and recording layer, wherein the first information unit includes write strategy parameters for first write strategy type to be used for the writing speed and recording layer, wherein the first write strategy type is one of a plurality of write strategy types applicable to the same writing speed and recording layer, and the second information unit for the same writing speed and recording layer includes write strategy parameters for second write strategy type different from the first write strategy type, and wherein each of the information units includes identification information for indicating that the corresponding write strategy type is an n-1 write strategy type or an n/2 write strategy type, where the n is a length of mark and each of the n-1 and n/2 represents the number of write pulses for forming a mark in the recording medium; and recording data at a specific writing speed based on at least one of the first and second information units.

22. The method as claimed in claim 21, further comprising:

identifying at least one of the first and second information units based on the identification information; and recording data at the specific writing speed based on the identified information unit.

23. The method as claimed in claim 22, wherein the identifying step identifies the at least one of the first and second information units stored in a memory from the reading step.

24. The method as claimed in any one of claims 21 to 23, wherein the first write strategy type is an n-1 write strategy type or an n/2 write strategy type, and the second write strategy type is an n-1 write strategy type or an n/2 write strategy type which is different from the first write strategy type, where n is a length of mark and each type represents a number of write pulse to form a corresponding mark.

25. The method as claimed in any one of claims 21 to 24, wherein each information unit includes type information identifying an applicable write strategy type.

26. A recording apparatus comprising:

a controller configured to generate a recording command and to control a recording operation; and a recorder/reproducer configured to perform a recording, based on the generated recording command from the controller, by reading a control information, the control information including at least first and second information units for a specific writing speed and recording layer, wherein the first information unit includes write strategy parameters for first write strategy type to be used for the writing speed and recording layer, and the second information unit includes write strategy parameters for a second write strategy type to be used for the same writing speed and recording layer, wherein the first write strategy type is one of a plurality of write strategy types applicable to the same writing speed and recording layer, and wherein each of the information units includes identification information for indicating that the corresponding write strategy type is an n-1 write strategy type or an n/2 write strategy type, where the n is a length of mark and each of the n-1 and n/2 represents the number of write pulses for forming a mark in the recording medium.

27. The apparatus of claim 26, wherein the controller identifies a corresponding information unit based on the identification information, and controls the recorder/reproducer to record data using the write strategy parameters included in the identified information unit.

28. The apparatus of claim 27, further comprising:

a memory for storing the read control information, wherein the controller identifies the corresponding information unit based on the identification information from the control information stored in the memory.

29. The apparatus of any one of claims 26 to 28, wherein each of the first and second information units further includes recording layer information for indicating the number of the recording layers.

30. An apparatus for writing data on a recording medium, comprising:

a writing/reading unit configured to read at least first and second information units from the recording medium and to write data on the recording medium, the first information unit including write strategy parameters for a first write strategy type to be used for a first recording layer, the second information unit including write strategy parameters for a second write strategy type to be used for a second recording layer; and a controller configured to identify one of the first and second information units according to the corresponding recording layer in which data is to be written and to control the writing/reading unit to write the data based on the write strategy parameters in the identified information unit.

31. The apparatus of claim 30, wherein the first write strategy type is n-1 write strategy type, and the second write strategy type is n/2 write strategy type, where the n is a length of mark and each of the n-1 and n/2 represents the number of write pulses for forming a corresponding mark in the recording medium.

32. The apparatus of claim 31, wherein the controller is configured to control the writing/reading unit to write the data using the number of pulses one less than the length of the mark to be formed in the first recording layer, and alternatively, using the number of pulses corresponding to half of the length of the mark to be formed in the second recording layer.

33. The apparatus of any one of claims 30 to 32, wherein the controller is configured to control the writing/reading unit to read the first information unit from the first recording layer and the second information unit from the second recording layer.

34. The apparatus of any one of claims 30 to 33, wherein each of the first and second information units further includes recording layer information for indicating the number of the recording layers.

35. The apparatus of any one of claims 30 to 34, wherein each of the first and second information units includes identification information for indicating a write strategy type of the corresponding information unit.

36. A recording medium having at least first and second recording layers, comprising:

user data areas for storing user data, the user data area being allocated to each of the first and second recording layers; and at least one control data area for storing at least first and second information units, the first information unit including write strategy parameters for a first write strategy type to be used for the first recording layer, the second information unit including write strategy parameters for a second write strategy type to be used for the second recording layer.

37. The recording medium of claim 36, wherein each of the first and second information units includes identification information for indicating a write strategy type of the corresponding information unit.

38. The recording medium of claim 36 or 37, wherein the first write strategy type is n-1 write strategy type, and the second write strategy type is n/2 write strategy type, where the n is a length of mark and each of the n-1 and n/2 represents the number of write pulses for forming a mark in the recording medium.

39. The recording medium of any one of claims 36 to 38, wherein the first information unit is recorded in the control data area of the first recording layer, and the second information unit is recorded in the control data area of the second recording layer.

40. The recording medium of any one of claims 36 to 39, wherein each of the first and second information units further includes recording layer information for indicating the number of the recording layers.