Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2007-10-23
2007-10-23
Korzuch, William (Department: 2627)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S077080, C360S077040, C360S078040
Reexamination Certificate
active
11437552
ABSTRACT:
Embodiments of the invention efficiently conduct servo corrections for preventing error propagation during SSW. In an example of the present invention, a servo position signal generator generates a servo position signal indicative of the current position of a read element on the basis of a servo signal from a servo channel. A target position generator generates correction data from multiply and add operations between the PES generated when the track that the read element is following is written, and pre-registered correction coefficients. A correction target position is generated from the correction data and a reference target position, and then output to a position error calculator. The position error calculator generates a position error signal (PES) from the servo position signal and the target position signal, and outputs PES to a servo controller. The servo controller generates a control signal (DACOUT) in accordance with PES, and a motor driver unit supplies an electric current of a required value to a VCM in accordance with the control signal.
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patent: 6600621 (2003-07-01), Yarmchuk
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Ozawa Yutaka
Sai Fuminori
Takasaki Kohji
Yamamoto Satoshi
Yanagisawa Hiroshi
Duncan Patrick
Hitachi Global Storage Technologies - Netherlands B.V.
Korzuch William
Olson Jason
Townsend and Townsend / and Crew LLP
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