High storage density disc data store employing controlled-angula

Details High storage density disc data store employing controlled-angula High storage density disc data store employing controlled-angula

1982-06-24

1985-01-08

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 78, G11B 555, G11B 1924

Patent

active

044929927

ABSTRACT:
In a disc data store for the storage of retrievable informational data in a plurality of concentric circular data storage tracks on a rotary medium accessed by a positioner operable to respond to a track command signal to place a data recording or recovering transducer into adjacence with a selected track where a disc rotator is operable to maintain the surface velocity of the medium beneath the transducer substantially constant regardlessly of the radius of the transducer on the medium for the purpose of maximizing the data storage capacity of the medium, the sluggishness of response of the angular velocity of the medium found in those systems where a position transducer senses the position of the recording or recovering transducer to provide an output for controlling the angular velocity of the medium is overcome by providing that the medium is rotated by an angular velocity control servomechanism operable to respond to the same track command signal as received by the positioner to so maintain the surface velocity of the medium relative to the recording or recovering transducer and capable of stabilizing the angular velocity in advance of the recording or recovering transducer arriving at a target track.

REFERENCES:
patent: 3646259 (1972-02-01), Schuller
patent: 3826965 (1974-07-01), Bringol
patent: 3939302 (1976-02-01), Kihara
patent: 4079942 (1978-03-01), Kunen
patent: 4190860 (1980-02-01), Somers et al.
Abstract EP 80 30 1119 Re Magnetic Memory System, K. Kimoto Kokai, No. 53-69015, 6-20-78.

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