Patent ID: 6798611
Filing Date: 2004-09-28
Classification: G11B

Abstract:
A disk storage system comprising:(a) a disk storage medium comprising a plurality of data tracks recorded thereon; (b) a read head positioned relative to the disk storage medium for reading data recorded in the data tracks; (c) a servo motor for controlling a position of the read head relative to the disk storage medium; (d) a servo controller for generating a motor control signal U applied to the servo motor, comprising: (i) a phase state generator for generating a discrete-time phase state signal X1k of the read head, the discrete-time phase state signal X1k comprising sample values occurring at a predetermined interval T; (ii) a linear signal generator, responsive to the discrete-time phase state signal X1k, for generating a linear control signal; (iii) a sliding mode signal generator, responsive to the discrete-time phase state signal X1k, for generating a sliding mode control signal; and (iv) a combiner for combining the linear control signal and the sliding mode control signal to generate the motor control signal Uk.