Patent ID: 6501613
Filing Date: 2002-12-31
Classification: G11B

Abstract:
A hard disk drive, comprising:a disk which has a surface; a spindle motor that rotates said disk; a transducer which can write information onto said disk and read information from said disk; an actuator arm that can move said transducer across said surface of said disk; and, a controller that controls said actuator arm to move said transducer across said disk surface using a generalized Fourier series seek acceleration trajectory having at least two terms, said controller performs a servo routine including determining an actual position of said transducer, computing a design position of said transducer, and generating a position correction value that is a function of said actual and design positions, determining an actual velocity of said transducer, computing a design velocity of said transducer, and generating a velocity correction value that is a function of said position correction value, said design velocity, and said actual velocity, said position correction value and said velocity correction value being used to vary the movement of said transducer.