Drive in-situ head disc interference detection using standard de

Details Drive in-situ head disc interference detection using standard de Drive in-situ head disc interference detection using standard de

1998-02-17

2000-08-08

Patidar, Jay

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360 31, G01R 3312

Patent

active

061006831

ABSTRACT:
Head disc interference is detected and analyzed using the standard deviation of read back signal frequency. First, the amount of longitudinal head oscillation affecting transducer read/write heads located in the hard drive is measured. Measuring the longitudinal head oscillation is achieved by determining the degree of frequency modulation associated with the read-back signal as compared with a constant frequency used to write the information. Second, this measured amount of oscillation is compared to a predefined threshold value. Finally, a head disc interference alarm is activated when the oscillation is greater than the defined threshold value.

REFERENCES:
patent: 5150050 (1992-09-01), Genheimer et al.
patent: 5168412 (1992-12-01), Doan et al.
patent: 5410439 (1995-04-01), Egbert et al.
patent: 5532586 (1996-07-01), Ishikawa
patent: 5600500 (1997-02-01), Madsen et al.
patent: 5838153 (1998-11-01), Inbar

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