Patent ID: 7203153
Filing Date: 2007-04-10
Classification: G11B

Abstract:
1. A recording medium provided with a write-once area allowing data to be recorded therein once and comprising a main data area as well as a management/control area for recording management/control information for recording data into said main data area and reproducing data from said main data area wherein: said main data area comprises a regular recording/reproduction area which data is recorded into and reproduced from as well as an alternate area for recording data due to a defect existing in said regular recording/reproduction area or for recording data in a process to renew data; said management/control area comprises a first alternate-address management information area for recording first alternate-address management information for managing alternate-address processes using said alternate area and a second alternate-address management information area for recording said alternate-address management information in an updateable state; and said main data area or said management/control area is used for recording written/unwritten state indication information for each data unit of said main data area and each data unit of said management/control area as information indicating whether or not data has been written into said data unit.