Changeover writing circuit for magnetic disk apparatus operable

Details Changeover writing circuit for magnetic disk apparatus operable Changeover writing circuit for magnetic disk apparatus operable

1988-11-22

1989-11-21

Faber, Alan

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 46, 360 67, 360 66, G11B 509

Patent

active

048826391

ABSTRACT:
A magnetic recording and reproducing apparatus which can write magnetic information in different recording periods so that information stored in a magnetic medium can be modified or corrected therewith in whichever recording period it is recorded. The apparatus comprises a bias change-over circuit for changing over the voltage to be applied to a magnetic head to effect recording in a recording period which is different from recording and reproducing characteristics of the magnetic head, and a writing circuit for supplying a writing current to the magnetic head in response to a voltage from the bias change-over circuit. Thus, by changing over the writing current, a recording period for recording on the magnetic medium can be modified.

REFERENCES:
patent: 3465321 (1966-02-01), Reisfeld
patent: 3930265 (1975-12-01), Kimura
patent: 3996614 (1976-12-01), Budejicky
patent: 4274116 (1981-06-01), Ida
patent: 4288827 (1981-09-01), Sato
patent: 4371901 (1983-02-01), Shah
patent: 4644419 (1987-02-01), Iinuma et al.
patent: 4656533 (1987-04-01), Sakai et al.
patent: 4805047 (1989-02-01), Nasu et al.
Nilsson, James W., Electric Circuits, Addison-Wesley, 1983 pp. 42-44.

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