Patent ID: 7929404

Claim:
An information recording medium, comprising: a plurality of recording layers to record therein record information, pre-pit data including a plurality of frames being recorded in each of the plurality of recording layers, each of the frames comprising: a sync bit for taking synchronization in identifying the pre-pit data; an identification bit row for identifying each of the frames; and a peculiar information bit row which is information peculiar to each of the frames, in this order, and in one of the frames, a layer identification flag for identifying the each recording layer being recorded in a head bit of the peculiar information bit row, wherein, the pre-pit data comprises two data groups, a first data group of the two data groups includes: an ECC block address of a position in which the pre-pit data is recorded; and a parity, in this order, a second data group of the two data groups includes: the ECC block address, the peculiar information bit row including the layer identification flag; and the parity, in this order, the second data group has a field ID for identifying the pre-pit data at a head of the second data group, and a space area is reserved as a reserved area between the peculiar information bit row and the parity, in the second data group.