Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1987-09-16
1989-05-30
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7702, 318561, 318594, G11B 2108, G11B 2110
Patent
active
048356328
ABSTRACT:
A digital servo control system in a data recording disk file has a single processor which generates the control signal to the actuator at two different rates, depending on whether the read/write head is being moved between data tracks or is following a specific track. A sampling clock generator receives servo timing information from a recorded servo disk surface and generates interrupt signals to the processor at predetermined frequencies selected by the time required for the processor to run the algorithm which generates the control signals. Upon receipt of a seek command to move the head of a target track, or a predetermined head position error signal indicative of arrival of the head to the target track, the microprocessor enables or disables appropriate interrupts so as to select one of the appropriate rates for generating the control signals. The digital servo control system thus allows servo position information to be sampled at a higher frequency during track following.
REFERENCES:
patent: 4103314 (1978-07-01), Case
patent: 4412161 (1983-10-01), Cornaby
patent: 4679103 (1987-07-01), Workman
patent: 4697127 (1987-09-01), Stich et al.
patent: 4751441 (1988-06-01), Lewis
Digital Control of Dynamic Systems, Franklin and Powell, Addison-Wesley Publishing Co. (1983) Chapter 6, pp. 131-139.
Computer Controlled Systems Theory and Design, Karl Astrom and Bjorn Wittenmark, Prentice-Hall, Inc., Englewood Cliffs, N.J. 07632, (1984), Chapter 4, pp. 88-92.
Shih Shih-Ming
Spanel Richard J.
Yamamoto Kenneth G.
Yu Mantle M.
Berthold Thomas R.
Faber Alan
Garland Steven R.
International Business Machines - Corporation
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