Head tracking system for a magnetic disk drive, and having an actuator for positioning the read/write head to the target track based on total error signal
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United States of America Patent
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Feb 17, 1998
Grant Date -
N/A
app pub date -
Dec 11, 1995
filing date -
Dec 14, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
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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