Mendelsohn, Drucker & Associates, P.C.
Frequency-based approach for detection and classification of hard-disc defect regions
In a hard-disc drive read channel, frequency-based measures are generated at two different data frequencies (e.g., 2T and DC) by applying a transform, such as a discrete Fourier transform (DFT), to signal values, such as ADC or equalizer output values, corresponding to, e.g., a 2T data pattern stored on the hard disc. The frequency-based measures are used to detect defect regions on the hard disc and/or to classify defect regions as being due to either thermal asperity (TA) or drop-out media defect (MD).
LSI Corporation
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Yuan Xing Zongwang Yang Shaohua George
Lee Li Han Yang Mathew