Hitachi Global Storage Technologies Netherlands B.v.

International Business Machines Corporation

Kishan Kumar Kumbla

Craig N Fukushima

Daniel James Malone, Sr

Mantle M Yu

Scott Arthur Thomas

Blake O Finstad

Peter Kui Ho

Steven Glenn Smith

Paul M Cisewski

In a method for implementing track shape control during a self servo-write process, an error in a targeted path for writing servo data onto a first track of a disk is detected. The error is correlated with a second error for a targeted path in a previously written track of the disk. A correction is generated for a feed-forward signal used to position a writing element which is used to write servo data for a subsequent track of the disk.

Adaptive track shape control during self servo-write

A hard disk drive having a self servo write offset error correction mechanism to improve self servo write process is disclosed. In accordance with certain aspects of the present invention, there is provided a self servo write method that can measure an accurate position offset between the read-head element and write-head element incorporated in a disk drive before servo data is recorded on the disk provided in the disk drive.

Read write offset error correction using geometric reference in self servo write process

A method and apparatus for providing a marker at the end of the adaptive self-servowrite process for adaptive formatting via the self-servowrite process. The mark is used later in the drive manufacturing process to identify the number of tracks written on the surface and thus determine the appropriate format to use in the drive.

Method and apparatus for providing a marker for adaptive formatting via a self-servowrite process

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Morgan Hill, CA, United States of America

Kishan Kumar Kumbla