Patent ID: 7177255

Claim:
A process for manufacturing an optical disk, comprising: (a) preparing an original master disk, comprising: (a 1 ) generating a second modulating signal corresponding to a disk identifying code by modulating a first modulating signal in correspondence with a pit row or a mark row by sub-data in accordance with a logical level of the sub-data such that a pit or a mark of the pit row or the mark row is locally changed; and (a 2 ) modulating a beam for recording by the second modulating signal and irradiating an original master disk with the modulated beam for recording, wherein the second modulating signal is generated by allocating one bit of the sub-data to an area of the pit row or the mark row including plural pits or marks, the pit row or the mark row having a minimum predetermined length to which one bit of the sub-data is allocated that is long enough such that the pit row or mark row can be observed by an optical inspection; (b) forming a stamper from the master disk; and (c) forming a disk substrate by the stamper.