Patent ID: 6724564
Filing Date: 2004-04-20
Classification: G11B

Abstract:
A disk drive, comprising:a disk, the disk having a recording surface; a head for reading and writing data on the recording surface; a voice coil motor for moving the head over the recording surface, the voice coil motor having a coil; and a servo control system for applying a current to the coil to cause the voice coil motor to move the head according to a seek distance, the servo control system generating a plurality of seek profiles for each of a plurality of seek distances and a plurality of current limits for the plurality of seek profiles, each of the plurality of seek profiles defining a plan for controlling the current to be applied to the coil while the voice coil motor is operated over the seek distance, each of the plurality of current limits defining a maximum current allowed while controlling the current to be applied to the coil, the servo control system including a seek profile generator for determining a relevant seek profile for each of the plurality of seek distances, the relevant seek profile being relevant to the seek distance, the seek profile generator including a table for storing the plurality of seek profiles, the table comprising a current limit for at least one range of seek distances within the plurality of seek distances, wherein the plurality of current limits can prevent the coil from overheating while maintaining performance objectives for seek operations.