Patent ID: 7490262
Filing Date: 2009-02-10
Classification: G11B

Abstract:
1. A method of managing defects in an information storage medium comprising a data area including a user data area for recording data and a spare area for recording a replacement block to replace a defect block occurring in the user data area, the method comprising: reading a defect list which comprises at least one defect entry from the information storage medium, the defect entry comprising first state information which indicates a status of the defect block or a status of the replacement block for replacing the defect block, second state information which indicates whether data recorded in the defect block or the replacement block is valid, location information of the defect block and location information of the replacement block; certifying a block corresponding to a defect entry whose second state information indicates that data recorded in the defect block or the replacement block is not valid; and changing the first state information or the second state information of the defect entry corresponding to the block if the block is determined to have a defect by certificate, and removing the defect entry corresponding to the block from the defect list if the block is determined not to have the defect by certification.