Patent ID: 8332685

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 state information or the second state information, according to a result of the certification, wherein the defect list comprises a defect list header comprising information on a number of defect blocks, and wherein the information on the number of defect blocks comprises: information on a number of defect blocks; information on a number of available spare blocks; information on a number of unavailable spare blocks; and information on a number of defectable blocks.