| 摘要 |
Includes two substrates (11a, b) and an adhesive layer (3) sandwiched between them. A ring shaped main-information area (12a, 12b) stores the main disc information that is recorded or read by a laser beam. Both substrate layers have an individual recognizing area (4a), in which identification information for uniquely identifying the optical disk is recorded before the two layers are sealed together. The identification information can only subsequently be read, but cannot be recorded and changed, by using the laser beam used for recording or reading the main information. |
