Sony Corporation

Hideo Tada

Yasuo Tone

Junichi Horigome

Masayoshi Nagata

Shigeo Yamaguchi

Takayoshi Chiba

Masatoshi Nishino

Norichika Mine

To enable a physically rewritable disc to be appropriately used as a write-once type. When the rewritable disc is used in rewritable application, the position where writing of a predetermined data unit (for example, an ECC block) in data is started is set to a first position with respect to a reference position to record or play back the data. In contrast, when the rewritable disc is used in write-once application, the position where writing of the predetermined data unit in the data is started is set to a second position different from first position to record or play back the data. The position where writing of the data is started in the rewritable application is shifted from the position where writing of the data is started in the write-once application to disable rewriting of the data recorded on a rewritable recording medium when the rewritable recording medium for the write-once application is loaded in a recording-playback apparatus that does not assume the use of the rewritable recording medium in the write-once application.

Recording device, recording method, reproducing device, and reproducing method

Pieces of address information are recorded on an optical disc such that they are successively continuous addresses within each zone but discontinuous at a beginning of a zone next to the previous zone, and an address after repeating the addresses of the previous zone for two rounds becomes the forefront address of the zone next to the previous zone. Access to the land tracks is performed by returning to the first address position in a zone after the addresses of the groove tracks become the last address of the zone, and the access is performed by recognizing an address continued from the last address of the groove tracks suppositionally on the pieces of address information recorded on the groove tracks, and then the access is successively performed to move to the next zone after the addresses of the land tracks become the last address of the zone.

ZCAV optical and method for accessing thereof

An optical disc apparatus and data recording method simplifies debugging when supplying a large quantity of software with a the reproducing only optical disc in place of a optical magnetic disc. The optical disc apparatus and data recording method converts a data sequence into a format to be recorded on reproducing only optical discs and records on an optical magnetic disc. The behavior when accessing optical discs will be restored in utilizing such optical magnetic disc.

Methods and apparatus for recording to and reproducing from an optical

Growing community of inventors

Tokyo, Japan

Hideo Tada