Power saving circuit arrangement for an apparatus for data trans

Details Power saving circuit arrangement for an apparatus for data trans Power saving circuit arrangement for an apparatus for data trans

1984-07-25

1987-10-13

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

360 99, 360 75, 360 60, G11B 1900, G11B 1902, G11B 2102

Patent

active

047002433

ABSTRACT:
A floppy disk drive which, together with one or more like devices, is daisy chained to host equipment comprising a central processor unit and an associated controller. Each disk drive comprises a disk motor for rotating a record disk under the control of a disk motor drive circuit, a head motor for incrementally moving a transducer head radially of the record disk under the control of a head motor drive circuit, and a read/write circuit for processing data read from, or to be written on, the record disk via the transducer head. The host equipment produces, among other control signals, a MOTOR ON signal for the on/off control of the disk motor via the disk motor drive circuit. In order to avoid waste of electric power, not only the disk motor drive circuit but also at least one, preferably both, of the head motor drive circuit and the read/write circuit is connected to a common power line via a power control switch which is closed only when the MOTOR ON signal is in a prescribed state to cause rotation of the disk motor.

REFERENCES:
patent: 3678481 (1972-07-01), Dalziel et al.
patent: 3956740 (1976-05-01), Jones et al.
patent: 4089029 (1978-05-01), Castrodale et al.
patent: 4458273 (1984-07-01), Johnson
patent: 4563715 (1986-01-01), Kawamura et al.
IBM TDB vol. 22, No. 8A "Sequential Power Connection", Dye, Jan./80, pp. 3378-3379.
Digita Design "Floppy Drive Innovations: Challenging Hard Disks", Nov. 1977, pp. 8-10.

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