Servo writing a disk drive using correction values that...

Details Servo writing a disk drive using correction values that... Servo writing a disk drive using correction values that...

2007-11-20

2007-11-20

Korzuch, William (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077010, C360S078040

Reexamination Certificate

active

11431303

ABSTRACT:
Servo writing a disk of a disk drive is disclosed. A phase locked loop (PLL) is synchronized to first sectors previously written on a first track, and second sectors are written to a second track using the PLL, wherein a plurality of phase errors corresponding to the second sectors are saved. A correction value is computed corresponding to a selected one of the second sectors, wherein the correction value is computed in response to a plurality of the phase errors generated for a plurality of the second sectors leading the selected sector. The PLL is synchronized to the second sectors using the correction value, a third sector is written to a third track using the PLL, and a phase error is saved corresponding to the third sector.

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U.S. Appl. No. 09/993,778 entitled “Servo Circuit Having a Synchronous Servo Channel and Method for Synchronously Recovering Servo Data”.
U.S. Appl. No. 10/875,591 entitled “Servo Writing a Disk Drive by Writing Multi-Bit Sync Marks in Spiral Tracks for Improved Servo Writing”.
U.S. Appl. No. 10/911,039 entitled “Servo Writing a Disk Drive by Synchronizing a Servo Write Clock to a Reference Pattern on the Disk and Compensating for Repeatable Phase Error”.

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