Patent ID: 7136258
Filing Date: 2006-11-14
Classification: G11B

Abstract:
1. A rotational recording apparatus comprising: a head for reading data from a rotatable recording medium; head driving means for driving said head; head position detection means for outputting data for a current position of said head on said recording medium; control means for acquiring a difference between said current position data and a target position, and for generating a feedback control signal to be transmitted to said head driving means, wherein said target position is derived by adding a ramp element to a sine-wave element; adaptive filters for outputting said feed forward control signal to said head driving means, and for adaptively changing coefficients of said adaptive filters; adaptive algorithm means for calculating said coefficients of said adaptive filters; and a filter for removing elements other than sine-wave elements that are included for said difference and said target position, and for generating data to be input to said adaptive algorithm means, wherein a target head position trajectory, extended upon the reception of a seek command from a current head position to a seek position designated by a seek command, is defined as a trajectory generated by said target position.