Magneto-optical disc having preformatted information to prevent

Details Magneto-optical disc having preformatted information to prevent Magneto-optical disc having preformatted information to prevent

1992-04-14

1997-07-22

Epps, Georgia Y.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, 369 48, 369 84, 369 13, 360 60, G11B 724, G11B 1504

Patent

active

056509910

ABSTRACT:
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.

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patent: 5166921 (1992-11-01), Matsui
patent: 5237547 (1993-08-01), Ohkuma et al.
patent: 5255261 (1993-10-01), Iida et al.
patent: 5345435 (1994-09-01), Yamasaki
patent: 5373498 (1994-12-01), Tagiri

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