Patent ID: 6031684
Filing Date: 2000-02-29
Classification: G11B

Abstract:
A method for optimizing gain in a disc drive servo circuit, comprising steps of:(a) initiating a seek of a selected length by providing reference current, velocity and position signals to move a head of the disc drive from an initial track to a destination track over a succession of time periods using a first value of gain;(b) determining a position error at each time period of the seek in relation to the difference between the reference position signal and an estimated position signal indicative of estimated position for the head;(c) determining an accumulated position error value in relation to the sum of the position errors for each time period of the seek;(d) generating a normalized accumulated position error value in relation to the accumulated position error divided by a value indicative of the length of the seek;(e) obtaining a gain adjustment value in relation to the difference between the normalized accumulated position error value and a nominal position error value associated with a nominal value of gain for the servo circuit; and(f) determining a second, updated value of gain in relation to a difference between the first gain and the gain adjustment value, the second updated value of gain stored for use during a subsequent performance of step (a).