Track accessing circuitry for a disk file with switchable filter

Details Track accessing circuitry for a disk file with switchable filter Track accessing circuitry for a disk file with switchable filter

1977-04-12

1978-06-20

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 2108, G11B 555

Patent

active

040965341

ABSTRACT:
Circuitry for providing a high speed access by a swingable arm and a transducer carried thereby across a plurality of tracks on a rotatable data storage device to a target track on the rotatable device including a speed indicating circuit connected with the transducer for indicating the speed of the transducer in crossing tracks on the rotatable device and a switchable filter effectively between the transducer and said speed indicating circuit which has a high roll off as the transducer crosses the tracks at a high speed and has a low roll off as the transducer approaches the target track at a relatively low speed so as to thereby cause the speed indicating circuit to accurately indicate the speed of the transducer in moving across the tracks of the rotatable device.

REFERENCES:
patent: 3122687 (1964-02-01), Romvari
patent: 3209338 (1965-09-01), Romvari
patent: 3399391 (1968-08-01), Barrosse
patent: 3691543 (1972-09-01), Mueller
patent: 3696354 (1972-10-01), Palumbo et al.
patent: 3699555 (1972-10-01), Duvall
patent: 3789378 (1974-01-01), Bonzano et al.
patent: 3820712 (1974-06-01), Oswald
patent: 3821804 (1974-06-01), Stevenson et al.
patent: 3936876 (1976-02-01), Taylor
IBM Tech. Disc. Bull., vol. 16, No. 12, 5/74, pp. 4064-4065.
IBM Tech. Disc. Bull., vol. 17, No. 5, 10/74, pp. 1468-1469.

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