Patent ID: 7327103
Filing Date: 2008-02-05
Classification: G11B,H02P

Abstract:
1. In a disk drive that includes a head, a disk, a microprocessor, a driver and a voice coil motor, wherein the head reads from and writes to the disk, the microprocessor provides a command current to the driver, the driver provides a coil current to the voice coil motor in response to the command current, the voice coil motor radially positions the head relative to the disk in response to the coil current, and the coil current flows through a coil in the voice coil motor, the driver comprising: a sensor that provides a sense current by sensing the coil current; a comparator that provides an error current by determining a difference between the command current and the sense current; an integrator that provides an integrated error current by integrating the error current; and an amplifier that provides the coil current by amplifying the integrated error current.