Servo Marginalization

摘要

Servo channel noise limits are defined through Viterbi decisions based on servo gate signals. Y values are used to produce a first Viterbi decision at each servo gate. Viterbi decisions and Y values are used to produce ideal Y values. Y values and ideal Y values are used to produce an error value which is adjusted by a noise factor based on estimated channel characteristics. The noise value is combined with Y values and used to produce a second Viterbi decision at each servo gate.

主权项

1. A hard drive system comprising:
a processor; a memory connected to the processor; a data store comprising a servo connected to the processor; and computer executable program code, wherein the computer executable program code configures the processor to:
produce one or more Y values, wherein the one or more Y values comprise a servo channel noise component;produce one or more ideal Y values;combine the Y values and ideal Y values; andproduce two or more Viterbi decisions.