Power-saving read/write circuit for apparatus for digital data t

Details Power-saving read/write circuit for apparatus for digital data t Power-saving read/write circuit for apparatus for digital data t

1987-10-07

1989-03-28

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Signal switching

360 46, G11B 1519, G11B 509

Patent

active

048169340

ABSTRACT:
A magnetic disk drive of the type comprising at least one read/write head assembly having a read/write coil which is center-tapped to provide a pair of coil halves which are alternately excited during writing, and a write terminate resistor connected between the coil halves for preventing the flow of oscillatory current therethrough during writing. In order to electrically isolate the write terminate resistor from the read circuit also coupled to the opposite extremities of the read/write coil, alternating-current switches are connected between the write terminate resistor and the read/write coil so as to be away from the paths of write current through the coil. The alternating-current switches are rendered conductive only during writing.

REFERENCES:
patent: 4639794 (1987-01-01), Ferrier
patent: 4651235 (1987-03-01), Morita et al.
patent: 4656533 (1987-04-01), Sakai et al.
"The Latest Floppy Dish Drives and Their Application Knowhow", p. 67.

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