| 摘要 |
The optical disk disclosed has optical memory systems for data recording and reproduction, and includes a plurality of grooves, a plurality of lands, and a plurality of pre-bits. The grooves extend circumferentially of the optical disk, and the lands are defined by the grooves. The pre-pits are formed in the lands such that portions of an inner periphery side or an outer periphery side of each of the lands are cut out so as to provide such pre-pits. When reading out data on the land, pre-pit data produced thereon is used directly, and when reading out data in the grooves, data detected by crosstalk from pre-pits produced on the lands is used. The problem that it is difficult to form the pre-pits both on the lands and on the grooves has been overcome.
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