Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2005-08-09
2005-08-09
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
C360S075000
Reexamination Certificate
active
06927929
ABSTRACT:
A position error signal amplitude indicative of the distance between an expected position of a magnetic head relative to the track centerline of a magnetic data storage and retrieval system and an actual position of the magnetic head relative to the track centerline is detected and filtered. The signal is filtered to generate a sway mode signal amplitude indicative of an oscillation of the actual position of the magnetic head relative to the track centerline in the frequency range of the filter. The absolute value of the sway mode signal amplitude is then determined. If the absolute value of the sway mode signal exceeds a predetermined threshold value that correlates to a high probability of impending a head-disk crash, a warning signal is propagated. Alternative embodiments similarly predict the possibility of head-disk crash on the basis of the maximum value of several samples of the position error signal and on the basis of the maximum value of several samples of the square of the position error signal amplitude
REFERENCES:
patent: 6125154 (2000-09-01), Sutardja
patent: 6600622 (2003-07-01), Smith
patent: 6690534 (2004-02-01), Ding et al.
Gong Karl
Ottesen Hal Hjalmar
Smith Gordon James
Davidson Dan I
Dillon & Yudell LLP
Hitachi Global Storage Technologies - Netherlands B.V.
Hudspeth David
Millert Douglas A.
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