Patent ID: 7577081

Claim:
An information recording medium comprising: a recordable area for information provided with an information track formed spirally or in coaxial circles having a groove in a first depth being prerecorded with a frequency signal and a land pre-pit address signal from an inner circumference of said information track and enabling to record ECC blocked data added with an error correction code; a first read only area having a pit in a second depth prerecorded with a frequency signal to be recorded with control data to be reproduced as a pit; and a second read only area having a pit in said first depth prerecorded with a frequency signal and a land pre-pit address signal to be recorded with a reproduction signal as a pit, wherein each tracking error signal at a time of tracking off in a boundary between said recordable area and said first read only area and another boundary between said first record only area and said second read only area is defined as a ratio of maximum amplitude in both directions from a center of maximum amplitude of said tracking error signal at the time of tracking off in said recordable area.