Patent ID: 8767519

Claim:
A disc shaped information recording medium, comprising: (a) a lead-in area provided in an inner circumferential side of the disc shaped information recording medium, the lead-in area including: (1) a first read only area in which information is formed in a plurality of information tracks in spiral as a first pit area having a first physical characteristic in a unit of first specific block, (2) a second read only area in which information is formed in a plurality of tracks in spiral allocated in an outer circumferential side of the first read only area as a second pit area having a second physical characteristic in a unit of second specific block, wherein the second pit area is different from the first pit area in a physical characteristic, and (3) a third read only area in which information is formed in a plurality of tracks in spiral as a third pit area having a third physical characteristic in a unit of third specific block, allocated between the first pit area and the second pit area, wherein the first pit area is connected continuously to the third pit area and the third pit area is connected continuously to the second pit area, wherein each of the first specific block in the first pit area, the second specific block in the second pit area and the third specific block in the third pit area is formed in a data configuration having a logically the same logic block, wherein the data configuration of the logic block is formed by an address unit having a specific amount of information constituted by a plurality of lines of combination of a specific sync and a specific unit of data, and further wherein the logic block is formed in a block having a specific amount of information by arranging a plurality of the address units.