Information recording device and data erasing method
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsHarumitsu Miyashita, Naohiro Kimura, Kohei Nakata
Life of this patent
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Abstract
Upon receiving an erase command for data recorded in a write-once optical disc, an information recording device corrupts data in an information area (synchronization signal in Run-in, frame synchronization signal, address information and the like), in an erased area on the optical disc, in which information necessary for synchronization of reproducing data by overwriting the data in the information area with an erasing pattern. The erased area is specified by an erase starting position and a size of data to be erased. In this way, the information recording device erases the data in the erased area.
Claims8
An information recording device capable of erasing data recorded in a write-once optical disc, comprising:
- a receiver that receives an erase command in which an erase starting position and a size of data to be erased are designated;
- an optical head that forms a recording mark on the optical disc;
- and
- a controller that controls the formation of the recording mark on the optical disc,
- wherein, upon receiving the erase command,
- the controller erases data of an erased area by overwriting data in an information area, to corrupt the data in the information area, using an erasing pattern,
- the information area including information necessary for synchronization when reproducing the data, and
- the erased area being specified by the erase starting position and size of the data to be erased on the optical disc,
- wherein the data erased in the information area includes data in an area for a sector synchronization signal which specifies a position of the recorded data,
- the area for the sector synchronization signal is included in a Run-in region of the optical disc, and
- after erasing data of a first area with a predetermined size in the erased area, the controller reproduces data from the first area, and erases data in a residual area of the erased area only in a case where the data of the first area is non-reproducible.
An information recording device capable of erasing data recorded in a write-once optical disc, comprising:
- a receiver that receives an erase command in which an erase starting position and a size of data to be erased are designated;
- an optical head that forms a recording mark on the optical disc;
- and
- a controller that controls the formation of the recording mark on the optical disc,
- wherein, upon receiving the erase command,
- the controller erases data of an erased area by overwriting data in an information area, to corrupt the data in the information area, using an erasing pattern,
- the information area including information necessary for synchronization when reproducing the data, and
- the erased area being specified by the erase starting position and size of the data to be erased on the optical disc,
- wherein the data erased in the information area includes data in an area for a sector synchronization signal which specifies a position of the recorded data,
- the area for the sector synchronization signal is included in a Run-in region of the optical disc, and
- in a case where the size of the data to be erased is smaller than a predetermined value, the controller records data, which is recorded in an area with a predetermined length from the erase starting position on the optical disc and is not included in the data to be erased, to an alternate area of the optical disc, and erases the data recorded in the area with a predetermined length starting from the erase starting position on the optical disc.
A data erasing method for erasing data recorded to a write-once optical disc, the data erasing method comprising:
- receiving an erase command in which an erase starting position and a size of data to be erased are designated;
- and
- corrupting data of an information area by overwriting the data of the information area using an erasing pattern thereby erasing the data in an erased area of the information area,
- the information area including information necessary for synchronization when reproducing the data, and
- the erased area being specified by the erase starting position and size of the data to be erased on the optical disc,
- wherein the data erased in the information area includes data in an area for a sector synchronization signal which specifies a position of the recorded data,
- the area for the sector synchronization signal is included in a Run-in region of the optical disc, and
- after erasing data of a first area with a predetermined size in the erased area, data is reproduced from the first area, and a data erasing operation is performed on a residual area of the erased area only in a case where the data of the first area is non-reproducible.
Dependencies are inferred from the claim text.