Method for optimizing viterbi detector threshold values

Details Method for optimizing viterbi detector threshold values Method for optimizing viterbi detector threshold values

1997-07-31

1999-09-21

Moise, Emmanuel L.

Error detection/correction and fault detection/recovery

Pulse or data error handling

Digital data error correction

369 59, 375341, 360 53, 360 48, H04L 100, G11B 700, G11B 509, G11B 390

Patent

active

059548371

ABSTRACT:
A magnetic disk drive apparatus adopting a PRML (Partial Response Maximum Likelihood) optimizes a Viterbi detector threshold value in order to optimize a read channel. The apparatus includes the steps of setting an average range of Viterbi detector threshold values for each head and storing the average range. The apparatus additionally includes the steps of writing and reading test data by using Viterbi detector threshold values within the average range of the Viterbi detector threshold values with respect to corresponding zones of the head, so as to evaluate minimum error rates for the respective zones of the head; setting the Viterbi detector threshold values corresponding to the minimum error rates for the respective zones of the head, as optimal Viterbi detector threshold values of the corresponding zones, and storing the optimal Viterbi detector threshold values into a storage; and storing the optimal Viterbi detector threshold values into a maintenance area of a disk.

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