Patent ID: 6128153
Filing Date: 2000-10-03
Classification: G11B

Abstract:
A disk drive comprising:a spindle motor having a rotatable spindle:a disk mounted to said spindle motor and storing servo information disposed along each of a plurality of concentric circles, said servo information defining a plurality of servo circular paths;a head for reproducing said servo information;a head positioning mechanism for positioning said head with respect to said disk;a detector for generating a head position signal from the reproduced servo information;a memory storing head position adjusting information representing eccentricity between said servo circular paths and hypothetical circular paths, said hypothetical circular paths being concentric circles around a center of said rotatable spindle; anda controller for generating a head position control signal to said head positioning mechanism based on said head position signal and said head position adjusting information so that said head tracks a selected one of said hypothetical circular paths for writing and/or reading data on said selected one of said hypothetical circular paths.