Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Reexamination Certificate
2006-12-18
2010-06-08
Negron, Daniell L (Department: 2627)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
C369S047140, CG9BS005026, CG9BS020055
Reexamination Certificate
active
07733591
ABSTRACT:
The invention includes apparatus and methods that allow a data storage device perform an enhanced data recovery procedure (DRP) that includes obtaining a new digital sampling of the voltages for the failing unit of data by re-reading the analog signal and converting it to digital form using an analog-to-digital conversion (ADC) using a fixed phase clock signal. The data samples are re-interpolated using a programmable delay line. The digital values representing the voltages are stored a buffer so that the data can be processed repeatedly using varying parameters as part of the data recovery procedure. Optionally the samples stored in the buffer can be processed in the reverse direction (from end of sector to beginning of sector) without requiring modification of the standard Viterbi detector since it inherently works on data processed in either direction.
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Bottemiller Kraig
Galbraith Richard Leo
Hanson Weldon Mark
Oenning Travis Roger
Ross Michael Joseph
Hitachi Global Storage Technologies - Netherlands B.V.
Knight G. Marlin
Negron Daniell L
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