Information recording device and data erasing method

Patent metadata

Field	Value
Publication number	US-2017194027-A1
Application number	US-201715468164-A
Country	US
Kind code	A1
Filing date	Mar 24, 2017
Priority date	Jul 3, 2015
Publication date	Jul 6, 2017
Grant date	—

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.

First claim

What is claimed is:

1 . 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 to the optical disc; and a controller that controls the formation of the recording mark to the optical disc, wherein, upon receiving the erase command,
the controller erase data of an erased area by overwriting data in an information area, to corrupt the data in the information area, with an erasing pattern,
the information area including information necessary for synchronization of 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.

2 . The information recording device according to claim 1 , wherein
the information necessary for the synchronization of reproducing the data includes a synchronization signal for data-clock PLL (phase locked loop), the synchronization signal being included in Run-in, and includes a frame synchronization signal indicating address information or a starting position of a frame.

3 . The information recording device according to claim 1 , wherein
upon receiving the erase command, the controller further overwrites data sequence disposed in an error correction direction in the erased area with the erasing pattern to corrupt the data sequence.

4 . The information recording device according to claim 1 , wherein the recording mark before the overwriting is changed to a longer recording mark by the overwriting.

5 . The information recording device according to claim 1 , wherein
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.

6 . The information recording device according to claim 1 , wherein
in a case where the size of the data to be erased is smaller than a predetermined value, the controller erases data of an area with a predetermined length from the erase starting position on the optical disc, and records data recorded in an area which is erased and is not included in the erased area to an alternate area of the optical disc.

7 . 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 with an erasing pattern for erasing the data of an erased area, the information area including information necessary for synchronization of 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.

8 . The data erasing method according to claim 7 , wherein
the information necessary for the synchronization of reproducing the data includes at least one of synchronization signal, being included in Run-in, for data-clock PLL (phase locked loop), an address information and a frame synchronization signal indicating starting position of a frame.

9 . The data erasing method according to claim 7 , wherein
when the erase command is received, data of a partial data sequence disposed in an error correction direction is further corrupted in the erased area by overwriting the data of the partial data sequence by the erasing pattern.

10 . The data erasing method according to claim 7 , wherein
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.

11 . The data erasing method according to claim 7 , wherein
in a case where the size of the data to be erased is smaller than a predetermined value, data of an area with a predetermined length is erased from the erase starting position on the optical disc, and data, recorded in an area which is erased and is not included in the erased area, is recorded to an alternate area of the optical disc.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Miyashita Harumitsu
• Kimura Naohiro
• Nakata Kohei

Classifications

• G11B2020/10898

  Overwriting or replacing recorded data · CPC title

• G11B2020/10851

  Erasing data on the record carrier · CPC title

• G11B20/10 Primary

  Digital recording or reproducing · CPC title

• G11B7/006

  Overwriting (G11B7/0065 takes precedence) · CPC title

• G11B7/0055 Primary

  Erasing (G11B7/006, G11B7/0065 take precedence) · CPC title