Adaptive feedforward control method to reduce noise during search

摘要

end. TECHNICAL FIELD The present invention relates to servo control in a hard disk drive.;I. SUMMARY OF THE INVENTION The present invention provides an adaptive feed forward control method for reducing search noise during track searching.;All. SUMMARY OF THE INVENTION The present invention provides a method and an apparatus for outputting a first adaptive feed forward value having a linear slope adaptively to a current command value for the hard disk drive servo control in a servo control deceleration period during a track search And outputting a second adaptive feed forward value by removing a high frequency component from the adaptive feed forward value, thereby reducing search noise and current control noise during servo control in the hard disk drive.;la. An important use of the invention is: hard disk drive servo control.