Patent ID: 7321544

Claim:
An information recording medium provided with land tracks and groove tracks arranged alternately, both of which contain information storage stripes for recording data, the information recording medium comprising in each of the information storage stripes: a data region where the data are recorded; and an identification region where boundaries between land tracks and groove tracks are protruded and recessed along the width of the land tracks and groove tracks, respectively, according to identification information which distinguishes the information storage stripes, the identification region further comprising a land identification section where an averaged position of the boundary between the land track and groove track is offset relative to the land track and a groove identification section where an averaged position of the boundary between the land track and groove track is offset relative to the groove track, and wherein an averaged width of the land tracks at positions where the land identification sections are provided is narrower than an averaged width of the land tracks at positions where the groove identification sections are provided, and an averaged width of the groove tracks at positions where the groove identification sections are provided is narrower than an averaged width of the groove tracks at positions where the land identification sections are provided.