Patent ID: 8027235
Filing Date: 2011-09-27
Classification: G11B

Abstract:
1. A defect management method of managing defects of an information recording media having a plurality of layers including a plurality of recording layers and in which recording/reproducing processing is performed in a block unit of an error correcting unit, said defect management method including, when a defective block, which meets a prescribed defect judgment condition, is detected in one recording layer of the plurality of recording layers: wherein the information recording media includes a plurality of spare areas for replacing the defective block, wherein the plurality of spare areas, which successively allocate alternate blocks for the defective area as alternate destinations of the defective block included in the defective area, are preferentially used, and wherein, when the alternate blocks cannot be sequentially allocated to any one spare area of the plurality of spare areas as an alternate destination of the defective block included in the defective area, a spare area, of the plurality of spare areas, to which a longest sequential alternate block can be allocated as the alternate destination of the defective block is preferentially used.