Head tracking system for a magnetic disk drive, and having an ac

Details Head tracking system for a magnetic disk drive, and having an ac Head tracking system for a magnetic disk drive, and having an ac

1995-12-11

1998-02-17

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 7707, 369 4434, G11B 5596

Patent

active

057197229

ABSTRACT:
A head tracking system for a magnetic head includes a servo signal generator for generating a position error signal, a low-pass filter passing the position error signal, an A/D converter converting the position error signal into a digital position error signal, a signal processor for generating a total error signal based on the digital position error signal and the distance between the present track and the target track, and an actuator moving the magnetic head to the target track based on the total position error signal. The low-pass filter has a cut-off frequency equal to one-half the sampling frequency of the A/D converter. If the frequency of the position error signal is high, the output of the servo signal is supplied by a selector directly to the A/D converter thereby bypassing the low-pass filter. Alternatively, the cut-off frequency of the low-pass filter is controlled based on the frequency of the position error signal.

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patent: 5465183 (1995-11-01), Hattori
Hasegawa et al; "Fast Access Control of the Head Positioning Using a Digital Signal Processor";SPLE/SPSE Symposium on Electronic Imaging (Santa Clara Feb. 14, 1990).
Patent Abstract of Japan, vol. 13 No. 180, Jan. 13, 1989, Minoru "Head Position Controller for Disk Storage Device".
Patent Abstract of Japan vol. 9 No. 276, Jun. 29, 1985, Kazuharu et al. "Retrieving Device of Information Track".

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