Patent ID: 7417927

Claim:
A method of managing a defective area in a disc, the disc comprising a user data area and a spare area other than the user data area having replacement data for user data recorded in the defective area of the user data area, the method comprising: reading temporary defect information and temporary defect management information in a temporary defect management area of the disc, wherein the temporary defect information comprises a defect position pointer that points to the defective area and a replacement position pointer that points to the position of the replacement data; and accessing the replacement data based on the temporary defect information and the temporary defect management information; wherein: the temporary defect management information comprises position information of the temporary defect information, the temporary defect information further comprises state information that specifies a state of the defective area, and the state information specifies whether the defective area is a continuous defect block extending over more than one block or a single defect block.