Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1978-01-03
1979-04-10
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 75, 360 98, 360135, G11B 2110, G11B 5012
Patent
active
041492013
ABSTRACT:
Principal embodiment teaches method and apparatus for fine positioning (centering) of a magnetic recording transducer relative to the concentric tracks of a rotatable magnetic disk having an "embedded" format (i.e., work data and servo data interspersed in alternate sectors along each track -- vs. "dedicated servo tracks"). The servo data sectors comprise repeating groups of servo tracks used to provide coarse and fine radial positioning signals for the transducer relative to the work data tracks.
The servo system controls head-positioning carriage means to keep the transducer gap "centered" during Reading and Writing operations using improved fast digital AGC circuit means and also provides timing information (synchronized clock signals, timing-decode) determined by the drive, rather than external means.
REFERENCES:
patent: 3691543 (1972-09-01), Mueller
patent: 3812533 (1974-05-01), Kimura
patent: 3860861 (1975-01-01), Gucker
patent: 3959820 (1976-05-01), Braun
patent: 3994016 (1976-11-01), Moghadam
patent: 4027388 (1977-05-01), Kril
patent: 4032984 (1977-06-01), Kaser et al.
patent: 4068267 (1978-01-01), Inouye
patent: 4072990 (1978-02-01), Case et al.
patent: 4075667 (1978-02-01), Rose et al.
IBM Tech. Disc. Bull., Lewkowicz et al., Tri-bit Servo Detection, vol. 19, No. 3, Aug. 1976, pp. 810-813.
Burroughs Corporation
Cass Nathan
Eddleman Alfred H.
McCormack John J.
Peterson Kevin R.
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