Patent ID: 8072859
Filing Date: 2011-12-06
Classification: G11B

Abstract:
1. A write-once optical disc onto which data is recorded in units of clusters, the write-once optical disc comprising: a user data area having at least one defective area, and a temporary defect management area including one or more data structures for updating defect management, and each data structure performs update separately, wherein each of the data structures includes at least one not-defective cluster in which a defective area list and structure information are included, the defective area list includes entries for the at least one defective area in the user data area of the optical disc, the entries in the defective area list of each data structure have been sorted in accordance with information of defective areas , the structure information is arranged in a last cluster of each data structure, and the structure information includes plural pieces of position information that indicate positions of clusters each of which constitutes a part of the defective area list.