Erasing device having a plurality of erasing modes

Details Erasing device having a plurality of erasing modes Erasing device having a plurality of erasing modes

1994-11-21

2000-01-11

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

360 57, 360 69, G11B 503

Patent

active

060142790

ABSTRACT:
An erasing device includes a first erasing mode for erasing the signal of an area of a recording medium, and a second erasing mode for erasing the signal of designated plural areas. The erasing operation in the first or second erasing mode is rendered possible as long as a necessary power supply is available, by selecting the limit power source voltage prohibiting the start of operation in the second erasing mode to be equal to or higher than the power source voltage prohibiting the start of operation of the first erasing mode, and also selecting the limit power source voltage prohibiting the continuation of operation in the second erasing mode, in the course of erasing operation in the second erasing mode, lower than the power source voltage prohibiting the start of operation of the first erasing mode. Also the operation can escape from the second erasing mode in suitable manner if the power supply becomes deficient in the course of operation in the second erasing mode.

REFERENCES:
patent: 4636905 (1987-01-01), Morimoto et al.
patent: 4670799 (1987-06-01), Ogura et al.
patent: 4685789 (1987-08-01), Kawamura et al.
patent: 4689698 (1987-08-01), Ishikawa et al.
patent: 4725902 (1988-02-01), Oda et al.
patent: 4740846 (1988-04-01), Ogawa
patent: 4943867 (1990-07-01), Suetaka et al.
patent: 5016124 (1991-05-01), Fukushima et al.
patent: 5570245 (1996-10-01), Fukushima

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