Patent ID: 8432784
Filing Date: 2013-04-30
Classification: G11B

Abstract:
1. An information recording medium having a plurality of information tracks spirally comprising: a control data area in which information is formed in a track as a first pit area having a first physical characteristic in a first unit of correction block, and recorded with control data that includes type information indicating a type of physical characteristic of the information recording medium; a first read only area in which information is formed in a track as a second pit area having a second physical characteristic in a second unit of correction block; an information track area in which information is recorded in a third unit of correction block; and a read-only intermediate area in which information is formed in a track as a third pit area having a third physical characteristic in a fourth unit of correction block, allocated between the control data area and the first read only area, wherein a configuration of the third physical characteristic in an area in the intermediate area adjacent to the control data area is different from the configuration of the third physical characteristic in another area in the intermediate area adjacent to the first read only area, and further wherein the third physical characteristic varies physically in the intermediate area so as to connect the control data area to the first read only area continuously.