Recording/playback device, recording device, and recording/playback method

A recording/playback device comprising:

• an information conversion unit converting video or audio information, received from an external source, to video or audio data for recording on an optical disk having at least two recording layers;
• a recording unit recording the video or audio data on said optical disk;
• and
• a playback unit playing back the video or audio data recorded on said optical disk,
• wherein said optical disk has a plurality of recording zones, each recording zone as a unit of recording includes said recording layers, the recording unit records the video or audio data sequentially, in two or more layers of a recording zone and after the video or audio data is recorded, if, in one of the recording zones, a part of the video or audio data recorded in said recording zone is erased logically, the device moves at least a part of the video or audio data left unerased in the recording zone to a recording zone on the disk different from the recording zone.

A recording device comprising:

• an information conversion unit converting video or audio information, received from an external source, to video or audio data for recording on an optical disk having at least two recording layers;
• and
• a recording unit recording the video or audio data on said optical disk,
• wherein said optical disk has a plurality of recording zones, each recording zone as a unit of recording includes said recording layers the recording unit records the video or audio data in two or more recording layers of a recording zone and after the data is recorded, if a part of the video data or audio data recorded in each layer is erased logically, the device moves at least a part of the video or audio data left unerased in said recording zone to a different recording layer or a different recording zone so that a number of layers, occupied by the video or audio data left unerased, is reduced in said recording zone.

A recording/playback method comprising the steps of:

• converting, by an information conversion unit, video or audio information, received from an external source, to video or audio data for recording on an optical disk having at least two recording layers;
• recording, by a recording unit, the video or audio data on said optical disk;
• and
• playing back, by a playback unit, the video or audio data recorded on said optical disk,
• wherein said optical disk has a plurality of recording zones, each recording zone as a unit of recording includes said recording layers and, when the video or audio data is sequentially recorded in two or more recording layers of a recording zone and then a part of the video data or audio data recorded in said recording zone is erased logically, at least a part of the video or audio data left unerased in said recording zone is moved to a different recording layer or recording zone so that a number of layers, occupied by the video or audio data left unerased, is reduced in said recording zone.

A recording/playback method comprising the steps of:

• converting, by an information conversion unit, video or audio information, received from an external source, to video or audio data for recording on an optical disk having at least two for recording on an optical disk having at least two recording layers;
• recording, by a recording unit, the video or audio data on said optical disk;
• and
• playing back, by a playback unit, the video or audio data recorded on said optical disk,
• wherein said optical disk has a plurality of recording zones, each recording zone as a unit of recording includes said recording layers and, when the video or audio data is sequentially recorded in two or more recording layers of a recording zone and then a part of the video our audio data recorded in said recording zone is erased logically, at least a part of the video or audio data left unerased in the recording zone is moved to some other recording zone on the disk different from the recording zone.

A recording method comprising the steps of:

• converting, by an information conversion unit, video or audio information, received from an external source, to video or audio data for recording on an optical disk having at least two recording layers;
• and
• recording, by a recording unit, the video or audio data on said optical disk,
• wherein said optical disk has a plurality of recording zones, each recording zone as a unit of recording includes said recording layers and, when the video or audio data is recorded in two or more recording layers of a recording zone and then a part of the video data or audio data recorded in said recording zone is erased logically, at least a part of the video or audio data left unerased in said recording zone is moved to a different recording layer or a different recording zone so that a number of layers, occupied by the video or audio data left unerased, is reduced in said recording zone.