US 7,457,071 B1Granted

Locating an initial servo track in order to servo write a disk drive from spiral tracks

AssigneeWestern Digital Technologies, Inc.

InventorEdgar D. Sheh

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Abstract

An embodiment of the present invention comprises a method of writing product servo sectors to a disk of a disk drive. The disk comprises a plurality of spiral tracks each having a high frequency signal interrupted at a predetermined interval by a sync mark. The head internal to the disk drive is used to read the spiral tracks to generate a read signal which is processed to detect the sync marks. An aberration is detected in the detected sync marks in order to locate an initial radial location of the head with respect to the disk. The read signal representing the high frequency signal in the spiral tracks is processed to generate a position error signal (PES) used to maintain the head along a substantially circular target path while using the head internal to the disk drive to write the product servo sectors along the circular target path.

Claims10

Dependent claims

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 disk comprising a plurality of spiral tracks, wherein each spiral track comprises a high frequency signal interrupted at a predetermined interval by a sync mark, the method comprising:

using the head internal to the disk drive to read the spiral tracks to generate a read signal;
processing the read signal to detect the sync marks in the spiral tracks;
detecting an aberration in the detected sync marks in order to locate an initial radial location of the head with respect to the disk;
processing the read signal representing the high frequency signal in the spiral tracks to generate a position error signal (PES) used to maintain the head along a substantially circular target path;
and
using the head internal to the disk drive to write the product servo sectors along the circular target path.

3 more elements

Dependencies are inferred from the claim text.