Magnetic data transfer apparatus having a combined read/write he

Details Magnetic data transfer apparatus having a combined read/write he Magnetic data transfer apparatus having a combined read/write he

1985-02-12

1987-03-17

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

G11B 509

Patent

active

046512357

ABSTRACT:
A magnetic disk drive is disclosed which has a write circuit for alternately exciting the a pair of coils of a read/write head in response to a two level write data signal when a write gate signal is in a prescribed state, thereby causing the coils to create magnetic fluxes in the opposite directions in the core. The write circuit excites a different one of the coils of the read/write head each time the write data signal changes in level from a predetermined one to the other. A final excitation circuit is provided for delaying, for example, the write gate signal for a preassigned length of time in order to cause the write circuit to excite a preselected one of the coils of the read/write head in a prescribed direction upon completion of the writing of the write data signal. Consequently, the residual magnetism of the read/write head is of one and the same orientation upon completion of writing, making possible the accurate detection of the peaks of the reproduced waveform at the time of subsequent reading.

REFERENCES:
patent: 3505662 (1970-04-01), Hibner
patent: 3618119 (1971-11-01), Rodriquez
patent: 4249219 (1981-02-01), Aoi et al.
patent: 4477846 (1984-10-01), Cottrell et al.
patent: 4525753 (1985-06-01), Shimeki et al.
"Practical Introduction to Floppy Disk Drives" (6th ed. 1982) (First edition published Jul. 10, 1979), p. 31.

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