Patent ID: 7646684
Filing Date: 2010-01-12
Classification: G11B

Abstract:
1. An information recording medium comprising a plurality of recording layers, said information recording medium comprising: a record information recording area for recording therein record information; a management information recording area for recording therein a plurality of types of management information for managing said record information recording area; and a reliability information recording area for recording therein a plurality of reliability information, each of which indicates reliability of whether or not respective one of the plurality of types of management information is correctly updated, wherein the plurality of types of management information includes at least one information out of space bitmap information for identifying an already recorded state or an unrecorded state with respect to each block of said record information recording area and defect list information for performing defect management, and the space bitmap information is the management information for each of the plurality of recording layers and the defect list information is the management information for entire of the plurality of recording layers, the plurality of reliability information indicate (i) reliability, for each of the plurality of recording layers, which indicates whether or not the space bitmap information is correctly updated and (ii) reliability, for entire of the plurality of recording layers, which indicates whether or not the defect list information is correctly updated.