In this invention, a partition within a test write area on an optical disc is divided into a plurality of sub-partitions to record test write data by different plural recording laser drive powers within respective subcode frames constituting the sub-partitions to determine an optimum laser drive power...http://www.google.com/patents/US5737289?utm_source=gb-gplus-sharePatent US5737289 - Data recording apparatus adapted for recording data signals onto an optical recording medium 
