Patent ID: 7310299

Claim:
An information recording medium having an information track formed spirally or in coaxial circles comprising: a recordable area for information 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; a first read only area having a pit in a second depth prerecorded with a frequency signal to be recorded with a reproduction signal as a pit; and a second read only area having a pit in a 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 a tracking error signal at a time of tracking off in a boundary between said recordable area and said first 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.