Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-09-11
2000-05-09
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7809, 360 7708, 369 4434, 708420, G11B 5596
Patent
active
060612002
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.
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Mee et al., Magnetic Recording, vol. II, Computer Data Storage, pp. 72-84. Dec. 1988.
Akin, Jr. William R.
Curran Richard T.
Ehrlich Richard M.
Shepherd Stanley H.
Wiseman James V.
Faber Alan
Groth Henry J.
Quantum Corporation
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