Patent ID: 6496322
Filing Date: 2002-12-17
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 including high order frequency components which are higher in frequency than the rotational frequency of said disk; 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 for storing head position adjusting information representing said high order frequency components, said head position adjusting information relating to the differences between said plurality of servo circular paths and hypothetical circular paths; and a 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.