Patent ID: 7630281

Claim:
An information recording medium, comprising: a data area for recording user data, and a defect management area for recording a defect list for managing defect areas existing in the data area; wherein: the defect list includes: a header located at a fixed position in the defect list, one or more defect entries including position information on the defect areas, and an anchor; the header, the one or more defect entries, and the anchor are located in this order in the defect list; the header includes: a defect list identifier for identifying the defect list; first update times information representing the number of times which the defect list has been updated; and a defect entry number representing the number of the one or more defect entries, the anchor includes: an anchor identifier for identifying the anchor of the defect list, and second update times information representing the number of times which the defect list has been updated, and a size of the anchor and an each size of the one or more defect entries are the same.