Optical disk and optical disk apparatus
AssigneeSanyo Electric Co., Ltd.
InventorMorio Nakatani
Life of this patent
Estimating the term…
Abstract
A disk has a plurality of recording layers in a laminated direction. When a defect occurs in any one of recording layers during disk manufacture, information about the defect is recorded in a read-only region in the recording layer. An optical disk apparatus determines which of the recording layers is usable based on the information about the defect read from the disk, and executes a recording/reproducing operation according to a determination result. Therefore, even when a disk with a defect in the recording layer is used, that disk may be offered to a user as an appropriately usable disk.
Claims9
A recordable optical disk having a plurality of recording layers in a laminated direction, the optical disk comprising:
- a recordable region;
- and
- a read-only region, wherein
- in the read-only region, information about usability of the recording layers is recorded.
An optical disk apparatus for recording and reproducing information to and from an optical disk, the optical disk comprising:
- a plurality of recording layers in a laminated direction;
- a recordable region;
- a read-only region;
- and
- information about usability of the recording layers being recorded in the read-only region, the optical disk apparatus, further comprising:
- a reproducing unit for reproducing the recordable region and the read-only region;
- a recording unit for recording information in the recordable region;
- and
- a control unit for controlling the reproducing unit and the recording unit, wherein
- the control unit sets a recording layer usable relative to the disk based on the information about usability of the recording layers reproduced by the reproducing unit.
An optical disc apparatus for reproducing information from an optical disk, the optical disk comprising:
- a plurality of recording layers in a laminated direction;
- a recordable region;
- a read-only region;
- and
- information about usability of the recording layers being recorded in the read-only region, the optical disk apparatus, further comprising:
- a reproducing unit for reproducing the recordable region and the read-only region;
- and
- a control unit for controlling the reproducing unit, wherein
- the control unit sets a recording layer reproducible relative to the disk, based on information about usability of the recording layers reproduced from the read-only region.
Dependencies are inferred from the claim text.