Power-saving data transfer apparatus with a flexible magnetic di

Details Power-saving data transfer apparatus with a flexible magnetic di Power-saving data transfer apparatus with a flexible magnetic di

1985-02-26

1987-08-18

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General recording or reproducing

Recording-or erasing-prevention

360 61, G11B 1504, G11B 1512

Patent

active

046881123

ABSTRACT:
A flexible magnetic disk drive is disclosed which has a disk drive motor for imparting rotation to the magnetic disk under the control of a "motor on" signal, and a stepping motor capable of stepwise rotation in response to stepping pulses for transporting a transducer head or heads radially of the magnetic disk for track to track accessing. Connected to the transducer heads for processing data transferred between them and the magnetic disk, a read/write circuit is connected to a supply terminal via a switching transistor. This switching transistor has connected to its base a switch control circuit for holding the switching transistor nonconductive when the disk drive motor is out of rotation and when the stepping motor is in rotation, and for holding the transistor conductive at least during the progress of data transfer between the transducer heads and the magnetic disk. Preferably, the switch control circuit is further adapted to hold the power control switch open from the moment the disk drive motor is set into rotation to the moment the speed of rotation of the disk drive motor builds up to a prescribed percentage of a normal speed at which data transfer is effected between the transducer heads and the record medium.

REFERENCES:
patent: 4089029 (1978-05-01), Castrodale et al.
patent: 4396955 (1983-08-01), Kohtani et al.
patent: 4445155 (1984-04-01), Takahashi et al.

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