Read/write magnetic disk apparatus operable in plural density mo

Details Read/write magnetic disk apparatus operable in plural density mo Read/write magnetic disk apparatus operable in plural density mo

1986-06-27

1989-02-14

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of equalizing

360 46, 360 67, G11B 509

Patent

active

048050474

ABSTRACT:
A magnetic recording and reproducing apparatus wherein mechanical deteriorations and induced noises can be eliminated and detection signals different in recording density can be read by a reading circuit without a misoperation. The apparatus comprises a filter circuit including a switching element for changing over between different impedance elements in order to allow reproduction from a magnetic medium which is recorded in a recording period which is different from recording and reproducing characteristics of said magnetic head. Preferably, the switching element is a field effect transistor.

REFERENCES:
patent: 3465321 (1969-09-01), 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: 4353100 (1982-10-01), Inoue
patent: 4371901 (1983-01-01), Shah
patent: 4644419 (1987-02-01), Iinuma et al.
patent: 4656533 (1987-04-01), Sakai et al.

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