Abstract: An aspect of the invention can be regarded as a disk drive that includes a disk drive base and a magnetic disk. The disk drive further includes a rotary actuator coupled to the disk drive base. The rotary actuator has an MR read element disposed adjacent the magnetic disk. The MR read element has a bias voltage. The disk drive further includes a rotatable spindle motor hub for rotating the magnetic disk positioned on the spindle motor hub. The spindle motor hub is in electrical communication with the magnetic disk. The spindle motor hub is mechanically coupled to and electrically insulated from the disk drive base. The disk drive further includes a circuit for applying a voltage equivalent to the bias voltage to the spindle motor hub such that a voltage potential between the MR read element and the magnetic disk is mitigated.

Abstract: A disc drive magnetic latch includes a magnet, a bucking coil, and a pair of pole pieces in a housing. The pole pieces have rectangular extension which extend through fingers in the housing thereby locking the pole pieces against rotational movement when a striker on the actuator strikes them. Heat staked tabs hold the assembly together.