Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1988-08-02
1990-09-04
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7804, G11B 555
Patent
active
049549073
ABSTRACT:
A data recording disk file, wherein head positioning servo information is located in sectors angularly spaced around the disk, utilizes an improved head positioning control system for data track following. The control system includes timing circuitry and head position detection circuitry for generating, respectively, a servo sector initiation signal and a signal representative of the head position relative to the centerline of the desired data track to be followed. The control system also includes a velocity detector for determining the velocity of the head relative to the data tracks, a microprocessor for computing an actuator input current signal for moving the actuator and the attached head so as to maintain the head on the desired data track between servo, and memory storage means for storing predetermined constants and values of previously measured head velocity and previously computed actuator input current signals. In response to the servo sector intiation signal, the microprocessor computs a new actuator input current signal based upon the new measured head position, the new measured head velocity, the previously measured head velocity, the previously computed actuator input current signal, and predetermined stored constants, and outputs this new current signal to the actuator. The microprocessor computation takes advantage of the fact that the disturbance to the position of the head during track following and between servo sectors is directly related to the difference between the actual acceleration of the head and the previously set head acceleration.
REFERENCES:
patent: 4068269 (1978-01-01), Commander et al.
patent: 4679103 (1987-07-01), Workman
patent: 4775903 (1988-10-01), Knowles
J. P. Mantey, "Offset Force Correction for Disk File", IBM TDB, vol. 21, No. 5, Oct. 1978, pp. 1792-1795.
R. K. Oswald, "Design of a Disk File Head-Positioning Servo", IBM Journal of Res. & Dev., Nov. 1974, pp. 506-512.
C. Maury, "High Track Density for Magnetic Disk Drive with an `Embedded Servo` Positioning System", IEEE Trans. on Magnetics, MAG-17, No. 4, Jul. 1981.
Berthold Thomas R.
Canney Vincent P.
International Business Machines - Corporation
Robertson David L.
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