Patent ID: 8630066

Claim:
A hard disk drive comprising: a disk which records information; a magnetic head which reads and writes the information from and to the disk; a head-gimbal assembly which supports the magnetic head; a support arm which supports the head-gimbal assembly; a coarse motion actuator which displaces and drives the support arm in such a direction as to intersect with a track direction of the disk; and a micromotion actuator for micromotion displacement which finely displaces and drives the head-gimbal assembly in such a direction as to intersect with the track direction of the disk, said hard disk drive further comprising: a damping unit including: a resonator in which a mass member is elastically supported to be displaceable in a predetermined direction, a base portion in which a mount portion including the mounted resonator is elastically supported to be displaceable in the predetermined direction, and a micromotion actuator for damping which displaces and drives the mount portion of the base portion in the predetermined direction, wherein the damping unit is disposed in the head-gimbal assembly so that the predetermined direction of the damping unit becomes the same as a displacement direction of the magnetic head by the driving of the micromotion actuator, and wherein the micromotion actuator for micromotion displacement drives the head-gimbal assembly, the micromotion actuator for damping drives the damping unit so that the micromotion displacement direction of the magnetic head and the displacement direction of the mount portion have opposite phases.