Floppy disk driver with protective rotation control apparatus

Details Floppy disk driver with protective rotation control apparatus Floppy disk driver with protective rotation control apparatus

1989-08-17

1991-10-08

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 741, 360 7303, G11B 1912, G11B 1920

Patent

active

050559508

ABSTRACT:
A floppy disk driver includes a loader for mounting a disk, a drive for rotating the disk at a predetermined rotational speed, a speed detector for detecting when the disk reaches the predetermined rotational speed, a fluctuation detector for detecting fluctuation in rotational speed of the disk, and a defect detector responsive to a speed detection signal produced by the speed detector and a fluctuation detection signal produced by the fluctuation detector for determining the presence of a defect condition based on production of the fluctuation detection signal during a predetermined period after production of the speed detection signal and for causing the drive to stop rotating the disk when a defect condition is determined to be present.

REFERENCES:
patent: 3829612 (1974-08-01), Beyers, Jr.
patent: 3983316 (1976-09-01), Schopp
patent: 4123779 (1978-10-01), Goldschmit
patent: 4658191 (1987-04-01), Okita et al.
patent: 4679181 (1987-07-01), Naito
patent: 4717969 (1988-01-01), Miyaki
patent: 4727530 (1988-02-01), Tomisawa
patent: 4779260 (1988-10-01), Kaheko et al.
patent: 4816937 (1989-03-01), Fukushima
patent: 4823203 (1989-04-01), Narusawa

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