Disk drive computing repeatable run out while actuator arm...

Details Disk drive computing repeatable run out while actuator arm... Disk drive computing repeatable run out while actuator arm...

2007-09-04

2007-09-04

Wellington, Andrea (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077060, C360S078040

Reexamination Certificate

active

11152415

ABSTRACT:
A disk drive is disclosed comprising a voice coil motor (VCM) for rotating an actuator arm about a pivot in order to actuate a head over a disk. The disk is rotated by a spindle motor, and a feed-forward compensation value is computed that compensate for a non-centric alignment of the disk with respect to the spindle motor. During a calibration mode, the VCM is controlled to press the actuator arm against a crash stop, and the feed-forward compensation value is computed in response to a position error signal (PES). The PES is generated in response to embedded servo sectors recorded on the disk, wherein each embedded servo sector comprises a track address for coarse alignment and servo bursts for fine alignment.

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