Richard F Curran

US Patent:

60612002, May 9, 2000

Filed:

Sep 11, 1997

Appl. No.:

8/927616

Inventors:

Stanley H. Shepherd - Morgan Hill CA
Richard M. Ehrlich - Saratoga CA
James V. Wiseman - Palo Alto CA
Richard T. Curran - Los Altos CA
William R. Akin - Morgan Hill CA

Assignee:

Quantum Corporation - Milpitas CA

International Classification:

G11B 5596

US Classification:

360 7704

Abstract:

Embedded servo sectors within a data track of a hard disk drive including a rotating data storage disk and a closed loop rotary actuator structure for positioning a data transducer head relative to the data track are written by a method including the steps of positioning the rotary actuator structure relative to the data track with a laser-interferometer-based servo writer and writing a pattern of circumferentially sequential, radially offset fine position bursts within each servo sector with the data transducer head, this step including writing-in undetermined position errors within each pattern being written, moving the disk drive to a self scan environment away from the servo writer, operating the rotary actuator structure in closed loop for following the data track by reference to the servo burst pattern, extracting the undetermined position error from each pattern thereby to iteratively determine written-in position errors, generating burst correction values from the determined written-in position errors, and writing the burst correction values to the data track for later use by the closed loop rotary actuator structure during following of the data track to remove the written-in position errors.

US Patent:

57935599, Aug 11, 1998

Filed:

Feb 27, 1996

Appl. No.:

8/607507

Inventors:

Stanley H. Shepherd - Morgan Hill CA
Richard M. Ehrlich - Saratoga CA
James V. Wiseman - Palo Alto CA
Richard T. Curran - Los Altos CA
William R. Akin - Morgan Hill CA

Assignee:

Quantum Corporation - Milpitas CA

International Classification:

G11B 5596

US Classification:

360 7809

Abstract:

Embedded servo sectors within a data track of a hard disk drive including a rotating data storage disk and a closed loop rotary actuator structure for positioning a data transducer head relative to the data track are written by a method including the steps of positioning the rotary actuator structure relative to the data track with a laser-interferometer-based servo writer and writing a pattern of circumferentially sequential, radially offset fine position bursts within each servo sector with the data transducer head, this step including writing-in undetermined position errors within each pattern being written, moving the disk drive to a self scan environment away from the servo writer, operating the rotary actuator structure in closed loop for following the data track by reference to the servo burst pattern, extracting the undetermined position error from each pattern thereby to iteratively determine written-in position errors, generating burst correction values from the determined written-in position errors, and writing the burst correction values to the data track for later use by the closed loop rotary actuator structure during following of the data track to remove the written-in position errors.