Track access control system preventing unintentional delay in mo

Details Track access control system preventing unintentional delay in mo Track access control system preventing unintentional delay in mo

1991-03-11

1993-07-27

Wambach, Margaret R.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, 360 7706, 360 7708, 360 7807, 360 7809, G11B 2102, G11B 5596

Patent

active

052315509

ABSTRACT:
A track access control system which is used in a rotating disc device, for positioning a servo head above a desired track by speed control and then position control. A timer starts when the head reaches a predetermined position which is out of a predetermined vicinity of the desired track, and when in the vicinity, the control is switched from the speed control to the position control. After a predetermined time has elapsed after the head reaches the predetermined position, the target speed is increased to push the head. Alternatively, after the predetermined time has elapsed after the head reaches the predetermined position, the control may be immediately switched from the speed control to the position control. In addition, in a return-to-zero operation, intervals between times the servo head passes over different tracks are monitored to detect a real speed of the head, and the target speed during the speed control is controlled according to the detected real speed.

REFERENCES:
patent: 4006394 (1977-02-01), Cuda et al.
patent: 4133011 (1979-01-01), Kurzweil, Jr.
patent: 4720754 (1988-01-01), Mizoshita et al.
patent: 4884152 (1989-11-01), Ide
patent: 4908561 (1990-03-01), Hashimoto
patent: 4963806 (1990-10-01), Shinohara et al.
patent: 4965501 (1990-10-01), Hashimoto
patent: 4993201 (1990-01-01), Emori et al.
patent: 5046058 (1991-09-01), Shimonou
IBM Tech. Disc. Bul. vol. 25, No. 9 Feb. 1983 "Track seek using continuous servo" Hansen et al. pp. 4572-4576.

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