| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily provide an adaptive filter suppressing external disturbance of a predetermined frequency during feedback control. <P>SOLUTION: The magnetic disk device includes a magnetic disk for recording servo information, a head for reading the servo information of the magnetic disk, and position control means. The position control means estimates, when positioning control of the head is performed, a predetermined frequency which becomes external disturbance in positioning control by using a high-order IIR digital filter including a variable coefficient based on positional error information generated from the servo information read from the head. <P>COPYRIGHT: (C)2013,JPO&INPIT |
