Rotatable storage apparatus with digitally responsive circuitry

Details Rotatable storage apparatus with digitally responsive circuitry Rotatable storage apparatus with digitally responsive circuitry

1977-11-14

1979-06-05

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 78, 360 97, G11B 500, G11B 2108

Patent

active

041575776

ABSTRACT:
A magnetic disk provided with different digital bytes inside and outside of the center line of a magnetic track on the disk, and transducer and recording mechanism for detecting the passage of the digital bytes across the transducer and recording these bytes as the disk rotates so as to determine the distance the center of the transducer is spaced from the center line of the magnetic track. The recorded digital information is used for stepping a transducer stepping motor a distance corresponding to the stored digital information to move the transducer to have its center in correspondence with the center of the track. In one embodiment, the digital information is stored in a circular reference track adjacent the edge of the disk, and in another embodiment the digital information is stored in spiral tracks extending toward the center of the disk.

REFERENCES:
patent: 3491347 (1970-01-01), Farrand
patent: 3812533 (1974-05-01), Kimura
IBM Technical Disclosure Bulletin.

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