| 摘要 |
<p>A disk device has a positioning control system (100, 102, 103, 106, 108) which has a disturbance suppression function in which the disturbance is suppressed quickly to prevent vibration of the head. In a positioning system having a disturbance suppression function of a disk device, an interface circuit (11-1) for setting a known disturbance frequency (DISTURBANCE FREQUENCY) to an initial value from the outside is installed. An unknown disturbance frequency can be immediately suppressed, or disturbance frequency control can be started from a known disturbance frequency, and even if the frequency changes thereafter, the estimated frequency can follow up to the disturbance, and the vibration of the head can be quickly prevented.</p> |
