Back to results
US 5,650,991 AGranted
Magneto-optical disc having preformatted information to prevent unauthorized data duplication
AssigneeSony Corporation
InventorKazuhiko Fujiie
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSony Corporation
InventorKazuhiko Fujiie
Estimating the term…
A magneto-optical disc 1 has a TOC area in which the cumulative recordable data volume or the cumulative recordable time is preformatted, and a user TOC area in which the cumulative recorded data volume or the cumulative recorded time is preformatted. When recording audio data, a system controller 17 restricts the volume of recording data or the recording time based on the cumulative recordable data volume, the cumulative recordable time, cumulative recorded data volume, the cumulative recorded time or the data compression factor, while causing an updated cumulative recorded data or an updated cumulative recorded time to be recorded. Restrictions of the recording may be performed based on the cumulative recorded data volume or the cumulative recorded time. A prepaid system may be realized by charging the fee conforming to the cumulative recordable data volume or the cumulative recordable time at the time of sale of the disc.
A disc-shaped recording medium comprising a recording surface which is divided into a first area in which user data is recorded, a second area in which data corresponding to the volume of the data recordable in the first area is recorded, and a third area in which data corresponding to the cumulative volume of the data recorded in the first area is recorded.
A disc recording apparatus for use with a disc-shaped recording medium which includes a recording surface divided into a first area in which user data is recorded, a second area in which data corresponding to the volume of the data recordable in the first area is recorded, and a third area in which the data corresponding to the cumulative volume of the data recorded in the first area is recorded, the disc recording apparatus comprising:
A disc recording apparatus for use with a disc-shaped recording medium including a recording surface divided into a first area in which user data is recorded, a second area in which data corresponding to the recordable time in the first area is recorded, and a third area in which data corresponding to the cumulative recorded time in the first area is recorded, the disc recording apparatus comprising:
Dependencies are inferred from the claim text.