Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1996-03-27
1999-06-15
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7804, G11B 555
Patent
active
059127821
ABSTRACT:
A servo control system and method for accurately controlling the actuator in a rotatable storage device by adjusting a corrective control signal according to the mode of operation of the actuator and the direction of actuator movement. During track following the corrective control signal is adjusted by a first factor determined by the ratio of a nominal force or torque factor to the actual force or torque factor at the current radial actuator position. When the actuator is seeking in a first direction, the corrective control signal is adjusted by a second factor determined by adjusting the first factor by a first amount, K.sub.fwd. When seeking in the reverse direction, the corrective control signal is adjusted by a third factor determined by adjusting the first factor by a second amount, K.sub.rev. K.sub.fwd incorporates measured variations in force or torque factor when the actuator is moving in the forward direction. Similarly, K.sub.rev incorporates measured variations in the force or torque factor when the actuator is moving in the reverse direction.
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IBM Research Journal, Nov. 1974, pp. 506-512, R.K. Oswald, "Design of a Disk File Head Positioning Servo".
Lee Troy T.
Oettinger Eric Gregory
Serrano Louis Joseph
Yu Mantle Man-Hon
Foerster Ingrid M.
Habermehl James L.
International Business Machines - Corporation
Lee Monica D.
Psitos Aristotelis M.
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