Patent ID: 8379505

Claim:
An optical information recording medium comprising: a first region on which medium identification information which causes a medium type to be identified is recorded with use of guide grooves each of which has wobbles having a cycle longer than a resolution limit of an optical system of an optical recording medium reproduction device; a second region on which content information is to be recorded with use of trains of marks each of which includes a mark or a space equal to or shorter than the resolution limit of the optical system, the second region having guide grooves having a track pitch smaller than that of the first region, and the second region being provided outside an outer periphery of the first region; and a blank region provided between the first region and the second region, the blank region having a first guide groove closest to the first region and a second guide groove closest to the second region, a track pitch between the first guide groove and an adjacent guide groove in a region outside the blank region being identical to the track pitch of the first region, a track pitch between the second guide groove and an adjacent guide groove in a region outside the blank region being identical to the track pitch of the second region, the blank region including at least two tracks having a track pitch which changes from the track pitch of the first region to the track pitch of the second region, and no information being recorded on the blank region.