| 摘要 |
There are included a plurality of record information recording areas (OPC areas PCA 0 , user data areas 109 - 0 or spare areas SA) for recording record information; a management information recording area (management area MA) for recording a plurality of management information for managing the respective ones of the plurality of record information recording areas; and a reliability information recording area (management area MA) for recording a plurality of reliability information (reliability flag group 150 ) that indicate, for each of the plurality of management information ( 120, 130 or 140 ), reliability as to whether the plurality of management information are correctly updated.
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