Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Reexamination Certificate
2008-05-06
2008-05-06
Tzeng, Fred F. (Department: 2627)
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
C360S046000
Reexamination Certificate
active
07369340
ABSTRACT:
A disk drive is disclosed comprising a disk having top and bottom surfaces, and top and bottom heads actuated over the top and bottom surfaces, respectively. Control circuitry detects a warping of the disk by writing a first test pattern to the top surface, reading the first test pattern to generate a first read signal, monitoring a first read signal value proportional to an amplitude of the first read signal, writing a second test pattern to the bottom surface, reading the second test pattern to generate a second read signal, monitoring a second read signal value proportional to an amplitude of the second read signal, and processing the first and second read signal values to detect a negative correlation between the amplitudes of the first and second read signals.
REFERENCES:
patent: 6292317 (2001-09-01), Alexander
patent: 6678108 (2004-01-01), Smith et al.
Choosang Chakrit
Dang Dean V.
Goode Jonas A.
Saram Philip Bernard
Davidson Dan I
Sheerin, Esq. Howard H.
Tzeng Fred F.
Western Digital Technologies Inc.
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