Recording disk having read-only recording area and writable reco

Details Recording disk having read-only recording area and writable reco Recording disk having read-only recording area and writable reco

1988-06-30

1990-07-17

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data in specific format

360 60, G11B 509

Patent

active

049424866

ABSTRACT:
A record disk has a read-only track area and a writable track area in which a guard band of a sufficient width is formed between such two areas for prevention of erroneous writing into the read-only track area during data writing into the writable track area. Apparatus using such disk employs a pair of heads with opposite azimuth angles and erasing of a track is first checked to prevent a read-only track from being erased. During such track erasing, a track recorded by a head with one azimuth is erased by a head with the other azimuth.

REFERENCES:
patent: 4229808 (1980-10-01), Hui
patent: 4499574 (1985-02-01), Braat
patent: 4672600 (1987-06-01), Balston et al.
patent: 4797752 (1989-01-01), Giddings
patent: 4821253 (1989-04-01), Usui et al.

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