Patent ID: 8140891

Claim:
An apparatus for recording/reproducing data on/from an information storage medium, the apparatus comprising: a write/read unit configured to record data on the information storage medium and to read recorded data from the information storage medium comprising a defect list comprising at least one defect entry; a control unit arranged to: re-initialize the information storage medium; if a block which is managed by the defect list belongs to a user data area after the re-initialization of the information storage medium, generate a defect entry corresponding to the block, and store the defect entry in the defect list, the defect entry comprising first state information indicating that the block may have a defect and location information of the block as location information of a defect block; certify the block; and remove the defect entry corresponding to the block from the defect list, or change the first information, according to a result of the certification.