Method for managing a defect area on high density optical disc write once

The present invention, a write-once relates to a defect area management method of the high density optical disc, a write-once Blu-ray disc (BD-WO) and the like replace the data of the defect area existing on a high density optical disc, the spare area girokham and, at the same time, generates a defect management information, such as disc definition structure for accessing the replacement recording the data on the spare area (DDS) information and Defect list (DFL) information, recorded in the defect management area (DMA) but administration, according to the update of the defective assign a management area in a certain recording region of the data area, and the disc definition structure information and the defect list information, such as defect management information, expand the recording size of the defect management area the use, is very useful inventions which allow a write-once Blu-ray disc and may be assigned to extensions and the defect management areas of the high density optical disk more efficiently. A write-once Blu-ray disc (BD-WO), a defect management area, defect management information, the disc definition structure information, defect list information, the user data area, the logical sector number