| 摘要 |
An optical disc including one or more than one recording layers has land areas ( 131 ) and groove areas ( 132 ) as recording tracks, wherein a data recording area of at least one of the recording layers is divided into a plurality of zones in a radial direction. In each of the divided zones, one or more than one prepits ( 133 ) with predetermined data are disposed in a track so that each header area is disposed at ever other boundary among the boundaries between the land areas and the groove areas. Each header area is shifted in the circumferential direction from other header areas apart from the each header area by two boundaries without overlapping in the radial direction.
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