| 摘要 |
In an optical disk according to one embodiment of this invention, the actual shortest mark length recorded on the optical disk is set equal to or smaller than L n0T ×0.6 when the shortest mark length calculated based on a reference clock is L n0T . The optical disk generates a playback signal suitably used for a playback apparatus that plays back information by use of a PRML method, for example.
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