| 摘要 |
PURPOSE:To obtain an optical disk device having high reliability without executing write of a short failure flag to a defective sector, by providing an optical disk medium having a defective list area on the head of each of plural divided recording areas on the recording surface, and recording and reproducing the information onto and from the optical disk medium by referring to a recorded defective list. CONSTITUTION:The titled device is constituted of an optical disk medium having plural divided areas on the recording surface and having a defective list area on the head of each recording area, a medium defect detecting device 13, a defective list recorder 14 for storing a detected defective list, and a data processor for recording and reproducing the information onto and from the optical disk medium by referring to the defective list recorded in the defective list recorder 14. In such a way, by detecting automatically a defect of the medium at a free time of the device, making a defective list in the recording area, and writing it in the defective list area on the optical list area, the list is read at the time of installing the medium, and an efficient processing can be executed without executing an access to a failure sector.
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