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AssigneeSharp Kabushiki Kaisha
InventorHiroshi Fuji
Estimating the term…
A magneto-optical disk 1 has a track, wherein one of the sidewalls (sidewall 4) of a groove 2 is wobbled by a wobble signal, and is provided with a notch 5 in the track having a different frequency from the wobble signal. The absolute position of the magneto-optical disk 1 is detected with a sample bit stored by the notch 5 of the track, and an information bit is stored with a recording/reproducing clock synchronizing with that position. By forming the notch 5 in this manner, information can always be recorded at the same information bit position, regardless of how many times information is rewritten. Therefore, a gap area and a buffer area, which have conventionally been essential, are not needed on the optical disk. Consequently, it is possible to use a recording area effectively.
An optical recording medium for recording information into a track, one of the sidewalls of the track wobbling at a predetermined frequency in accordance with either rotation synchronization information or address information, or both,
An optical recording medium for recording rotation synchronization information or address information by the wobbling of one of the sidewalls of a first track and the wobbling in the opposite direction of one of the sidewalls of a second track adjacent to the first track,
An optical recording medium for recording rotation synchronization information or address information by the wobbling of one of the sidewalls of a track,
Dependencies are inferred from the claim text.