| 摘要 |
An optical recording medium having an aligned prepit portion straddled on a plurality of tracks in a radius direction. The prepit portion includes a first and a second prepit portion divided in a track direction, wherein a synchronous information prepit of the respective first and second prepit portions is arranged on a boundary of the respective tracks. The first prepit portion includes the synchronous information prepit arranged at every two-track pitch in the radius direction, the second prepit portion includes the synchronous information prepit arranged at every two-track pitch in the radius direction, and the synchronous information prepit of the first prepit portion and the synchronous information prepit of the second prepit portion of the same track are arranged at opposite boundaries of the same track. Further, the prepit portion includes a gap between the first and second prepit portions.
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