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United States Patent
(io) Patent No.: (45) Date of Patent:
US 7,492,691 B2 Feb. 17, 2009
SUPPLEMENTAL MEMORY HAVING MEDIA DIRECTORY
Inventor: Tod Earhart, Mead, CO (US)
Assignee: InPhase Technologies, Inc., Longmont, CO (US)
Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 1192 days.
Filed: Jan. 14, 2004
Prior Publication Data
US 2004/0194151 Al Sep. 30, 2004
Related U.S. Application Data
Provisional application No. 60/440,862, filed on Jan. 15, 2003.
G11B 7/00 (2006.01)
U.S. CI 369/103; 359/22; 359/11;
Field of Classification Search 369/103,
369/30.4, 112.01, 262; 359/3, 22, 25, 11, 359/24,35,1; 360/92.1,133; 380/201,44;
725/135, 136; 365/125 See application file for complete search history.
U.S. PATENT DOCUMENTS
5,526,337 A * 6/1996 Houseyetal 369/103
5,719,691 A * 2/1998 Curtis etal 359/11
5,862,117 A 1/1999 Fuentesetal.
5,932,045 A 8/1999 Campbell et al.
6,081,857 A 6/2000 Frary
Disclosed is a holographic data storage device including holographic media for containing data, writing data to and reading data from. The storage device also includes at least one supplemental memory for containing at least a portion of a directory of the data contained in the holographic media. By locating directory information for the holographic media in a supplemental memory, areas of the holographic media that have not yet been written to can be determined prior to accessing the holographic media. In this way, activating photosensitive agents in unwritten areas of the holographic media can be avoided unless these areas are being written to.
16 Claims, 9 Drawing Sheets
Hitachi Maxell, Ltd. (Jan. 2004). "Maxell RLID System Coil-onChip: Lhe Contactless Solutions," located at <http://www.maxell. com/Home/rfid/coc.html> last visited on Jan. 7, 2004, four pages. Hitachi Maxell, Ltd. (Oct. 2002) "Maxell Coil-on-Chip RFID System, UART R/W Module, ME-M1000-UART-0001/0002" Maxell Manual, 36 pages.
Mok, F. et al. (2000). "Holographic Read-Only Memory" In Holographic Data Storage Coufal, H.J. et al. eds. Springer-Verlag, pp. 399-407.
Redfield, S. (2000). "Tamarack Optical Head Holographic Storage" In Holographic Data Storage Coufal, H.J. et al. eds., SpringerVerlag, pp. 343-357.
* cited by examiner