Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1974-08-12
1976-05-11
Tupper, Robert S.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360131, G11B 2110, G11B 566
Patent
active
039567699
ABSTRACT:
Magnetic recording apparatus employing a medium characterized by having a relatively high coercivity recording layer having servo tracks recorded therein, and a second layer of lower coercivity in which data may be recorded. The servo tracks are read by a head and this signal is used to properly position the head for writing and reading of data. If the medium is a disc, e.g. the servo tracks may be either concentric circles or a single spiral concentric with the center of the disc.
REFERENCES:
patent: 3404392 (1968-10-01), Sordello
patent: 3614756 (1971-10-01), McIntosh
"Recording Servo Information Below a Data Surface in a Homogeneous Medium", Schwarz, I.B.M. Tech. Disc. Bull., Vol. 17, No. 2, July 1974, p. 536.
Beecroft Harold James
Chari Srinivasan Venkata
Control Data Corporation
Schwarz Edward L.
Tupper Robert S.
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