Patent ID: 7203139
Filing Date: 2007-04-10
Classification: G11B

Abstract:
1. A recording medium having a plurality of recording layers each including a write-once recording area allowing data to be recorded therein only once as an area comprising: a regular recording reproduction area, which data is recorded into and reproduced from; an alternate area for recording data in an alternate-address process carried out due to a defect existing in said regular recording reproduction area or carried out to renew existing data; a first alternate-address management information area for recording alternate-address management information for managing alternate-address processes each using said alternate area in an updateable operation; and a second alternate-address management information area for recording said alternate-address management information after the alternate-address management information is written in the first alternate-address mananement information area and when the recording medium is finalized, wherein, for each data unit of said write-once recording area, written unwritten state indication information is recorded in the first alternate-address management information area as information indicating whether or not data has been written into said data unit.