| 摘要 |
A method of defect management for managing on a block-by-block basis a defective area in an information-recording medium is disclosed. The medium has a user-data area, a sparing area, and a defect-management information are. The block is of a predetermined size. The method includes the steps of, when a defective block in which the defective area is included is set to be replaced with a sparing block of the sparing area: dividing the sparing block into multiple subblocks so as to set identifying information, for identifying a sparing subblock in which data are replaced and a non-sparing subblock in which data are not replaced, as defect-management information; and setting block-management information, including information regarding the defective block and the sparing block, and information regarding an area in which non-sparing data not replaced with the sparing block are stored, as defect-management information.
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