Method for recording and reproducing information on and from an

Details Method for recording and reproducing information on and from an Method for recording and reproducing information on and from an

1990-03-23

1993-09-21

Nguyen, Hoa T.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 14, 369 47, 369 58, 369116, G11B 1304, G11B 1112, G11B 1110

Patent

active

052474941

ABSTRACT:
An optical disk is provided with a pre-recorded ROM zone and at least one of the write-once zone and an erasable-writable zone. Two types of information are pre-recorded in the ROM zone, including first information for controlling reading from and writing to the non-ROM zone or zones, and second information for use in data information production. Information is recorded and read as localized differences in reflectivity on the disk. A laser used for reading and writing is operated at a first, lower power level for reading and at a second, higher power level for writing. Data information is created using second information read from the ROM zone, and is written to and reproduced from the non-ROM zone or zones.

REFERENCES:
patent: 4451915 (1984-05-01), LaBudde et al.
patent: 4467383 (1984-08-01), Ohta et al.
patent: 4683371 (1987-07-01), Drexler
patent: 4688203 (1987-08-01), Koishi

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