| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve reliability of defect management. <P>SOLUTION: Reliability of defect management is obtained by providing a plurality of management data regions including a defect management region in a predetermined radius section region at a disk inner periphery such as a lead-in zone, and a management data region (information areas Info1, Info2) including a plurality of defect management regions is formed at a position which is apart in a disk radius direction across a recording/reproduction condition adjustment region (OPC) which is relatively large section. In the defect management region, a plurality of recording regions including an alternative region are provided as a region in which defect management information is recorded, so that the recording region can be changed according to an update frequency, an error state, and the like of the defect management region. <P>COPYRIGHT: (C)2012,JPO&INPIT |
