Storage apparatus for reducing a read error caused by a thermal asperity of a magneto-resistive head
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United States of America Patent
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Jan 23, 2001
Grant Date -
N/A
app pub date -
Oct 16, 1997
filing date -
Jun 13, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
For a read demodulating unit for demodulating read data and servo data which is used for head positioning from a reproduction waveform signal of a magneto-resistive head, a thermal asperity fault detecting unit for setting a predetermined threshold for the reproduction waveform signal and for generating a fault signal when the reproduction waveform signal exceeds the threshold is provided. When a thermal asperity fault is detected by the thermal asperity fault detecting unit, an increase in cut-off frequency of a high pass filter, an automatic gain control lock by an automatic gain control holding circuit, and a phase lock loop lock by a phase lock loop holding circuit are executed in an error avoiding unit.
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