Patent ID: 7414815

Claim:
A magnetic disk device comprising: a magnetic disk in which a data zone is formed; an actuator having a voice coil and a head slider carrying a magnetic head, the actuator being swung to move the magnetic head over the disk between an innermost position of the data zone and an outermost position of the data zone; and a magnet having a magnetization center and opposed to the voice coil so that a voice coil motor which swings the actuator is formed, the magnet having a north pole and a south pole confronting each other via the magnetization center, wherein the magnetic disk device is arranged so that a deviation of a center of the voice coil from the magnetization center when the magnetic head is in the innermost position of the data zone is made equal to a deviation of the center of the voice coil from the magnetization center when the magnetic head is in the outermost position of the data zone.