Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1996-03-26
1998-06-30
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 46, 360 25, 360 53, G11B 2736, G11B 502, G11B 509
Patent
active
057742855
ABSTRACT:
Method for optimizing parameter values in a read/write channel of a disc drive. A population of error rate points is obtained from selected ranges of a plurality of read/write channel parameters, each error rate point corresponding to a unique combination of parameter values and having an associated error rate value. A weight is determined for each of the error rate points through normalization to the minimum error rate value in the population. A threshold value is determined based upon the error rate values in a plurality of nominally identical disc drives and the weights are compared to the threshold value. Those error rate values having weights less than the threshold are selected and a center of gravity is determined therefrom. At such times that the entire population of error rate values has weights greater than the threshold value, the optimum parameter values are those that map to the center of gravity. Otherwise, for each error rate value having a weight greater than the threshold, the average and standard deviation are determined for neighboring (immediately adjacent) error rate values and the error rate value having the tightest distribution in the neighboring error rate values provides the optimum parameter values.
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Abdelnour Ghassan M.
Kassab Roger J.
Heller III Edward P.
McCarthy Bill D.
McCarthy Randall K.
Neal Regina Y.
Psitos Aristotelis M.
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