Magnetic head device

Details Magnetic head device Magnetic head device

1987-12-24

1990-01-30

Wolff, John H.

Dynamic magnetic information storage or retrieval

Head

Erase

360121, G11B 5265

Patent

active

048977462

ABSTRACT:
A magnetic head device for a floppy disk drive apparatus, which can read data from, and write data on, floppy disks of different recording densities is disclosed. The magnetic head device comprises a read/write head having at least two read/write gaps, an erase head, and gap selecting circuit. The read/write gaps have different gap length one another. Respective gap lengths correspond to the recording densities of the floppy disks. A gap selecting circuit of the magnetic head device selectes an optimal read/write gap for the floppy disk loaded to the floppy disk drive apparatus. The type, or the recording density, of the floppy disk loaded to the floppy disk drive apparatus is checked by means of a high recording density detecting switch. The detecting switch sends a signal to the gap selecting circuit in accordance with the recording density of the loaded floppy disk.

REFERENCES:
patent: 4622601 (1986-11-01), Isozaki et al.
patent: 4803571 (1989-02-01), Fujioka et al.
patent: 4805051 (1989-02-01), DeMarco et al.
IBM TDB, "Bidirectional Read-After-Write Tunnel Erase Head", Barrett et al., vol. 16, No. 12, May 1974, p. 3831.
IBM TDB, "Side Erase Magnetic Head", Dawson, vol. 8, No. 2, Jul. 1965, p. 220.

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