A mobile host device configured to draw electrical energy from an energy storage device includes a disk drive. The disk drive includes a disk drive enclosure including a base, a spindle motor attached to the base, a disk positioned on the spindle motor, a generator and a charging circuit. The generator may be coupled to the disk drive enclosure and/or the mobile host device and generates electrical energy from the motion of the mobile host device and/or disk drive. The charging circuit is configured to charge the energy storage device using the electrical energy generated by the generator.

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< Disk drive attenuating excitation of arm vibration mode by simultaneously driving secondary actuator for non-active head

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> Digital information recording/reproducing apparatus

> Positioner for precisely moving an E-block of a disk drive

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