Dynamic magnetic information storage or retrieval – Recording or reproducing an information signal and a control...
Reexamination Certificate
2005-11-23
2009-11-17
Feild, Joseph H (Department: 2627)
Dynamic magnetic information storage or retrieval
Recording or reproducing an information signal and a control...
C360S029000, C360S046000
Reexamination Certificate
active
07619841
ABSTRACT:
A disk drive is disclosed including a disk having a plurality of data tracks, wherein each data track comprises a plurality of data sectors and a plurality of servo sectors, and each servo sector comprises a plurality of servo bursts. A data path comprising a data decoder decodes a data read signal generated as a head passes over the data sectors, and a servo path demodulates a servo read signal generated as the head passes over the servo bursts. The servo path comprises a low pass filter operable to extract a low frequency component from the servo read signal, wherein the low pass filter does not operate on the data read signal. The servo path further comprises a subtractor operable to subtract the low frequency component from the servo read signal to generate a servo burst signal, and a servo demodulator operable to demodulate the servo burst signal.
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Feild Joseph H
Negrón Daniell L
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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