Patent ID: 6965489
Filing Date: 2005-11-15
Classification: G11B

Abstract:
1. A method of writing product servo sectors to a disk of a disk drive, the disk drive comprising control circuitry and a head disk assembly (HDA) comprising the disk, an actuator arm, a head connected to a distal end of the actuator arm, and a voice coil motor for rotating the actuator arm about a pivot to position the head radially over the disk, the method comprising the steps of: (a) inserting a head positioning pin of an external spiral servo writer into the HDA, the head positioning pin for engaging the actuator arm; (b) using the external spiral servo writer to derive a radial location of the head; (c) actuating the head positioning pin in response to the radial location of the head in a closed loop system to rotate the actuator arm about the pivot in order to position the head radially over the disk while: (d) removing the head positioning pin from the HDA; (e) synchronizing a servo write clock by: (f) writing the product servo sectors to the disk to define a plurality of radially spaced, concentric data tracks by: