| 摘要 |
PURPOSE:To execute the satisfactory reproduction even when the error factor between respective pieces of equipment is considered by time-base-compressing and recording the same signal as a synchronizing signal and the signal such as performance information succeeding to an unevenness pattern for a disk where the synchronizing signal is recorded as the unevenness pattern beforehand. CONSTITUTION:A recording disk 1, for example, is an optical magnetic disk having a vertical magnetizing film having a magnetic optical effect and rotated and driven with a constant linear velocity. A pregroup 2 is formed in a spiral shape on the disk 1, and on the land part between groups 2, an emboss area 4 composed of the unevenness pattern by a pit 3 in an inner circumferential direction and a signal recording area 5, in which an optical magnetic recording is executed, are alternately provided at an equal pitch. At the area 4, the parts of 44 bits in total of a frame synchronizing signal and a sub-code are recorded beforehand. At the area 5, 588 bits of the same signal as the area 4 and the signal such as performance information are time-base-compressed and recorded. Thus, even when the error factor between respective pieces of equipment at the time of recording and reproducing is considered, a satisfactory reproduction can be executed.
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