Dynamic magnetic information storage or retrieval – General recording or reproducing – Specifics of equalizing
Reexamination Certificate
2011-07-05
2011-07-05
Mercedes, Dismery E (Department: 2627)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Specifics of equalizing
C360S031000, C360S062000
Reexamination Certificate
active
07974037
ABSTRACT:
A data storage device includes a first filter that generates a short DC equalization target in response to a read back signal generated from magnetic patterns that are recorded on a storage medium using perpendicular recording. The data storage device also includes a first detector that generates an output sequence in response to the short DC equalization target. The data storage device also includes a high pass filter that attenuates DC components of the short DC equalization target and that passes low frequency components of the short DC equalization target above a cutoff frequency to generate a filtered signal. The data storage device also includes a second detector that processes the output sequence in response to the filtered signal.
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Galbraith Richard Leo
Oenning Travis Roger
Cahill Steven J.
Hitachi Global Storage Technologies - Netherlands B.V.
Mercedes Dismery E
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