External selector and internal controller for flexible disc stac

Details External selector and internal controller for flexible disc stac External selector and internal controller for flexible disc stac

1977-11-28

1979-03-06

Wolff, John H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 99, G11B 560, G11B 582

Patent

active

041434080

ABSTRACT:
A data storage device has a pressurized flexible disc stack. An external actuator creates a partial split allowing a transducer to read edge codings on the discs to locate a desired one. An internal controller controls the pressure within the center of the stack and defines a zone aligned with the actuator within which the pressure is maintained above the bistable range while locating the desired disc. Upon locating the desired disc, the pressure with the zone is dropped below the upper limit of the bistable range causing the partial split to open or expand into a full, stable separation allowing a read/write head to access the desired disc.

REFERENCES:
patent: 3936880 (1976-02-01), McGinnis et al.
patent: 4011590 (1977-03-01), Orlando
patent: 4011591 (1977-03-01), Orlando
patent: 4019204 (1977-04-01), Griffiths et al.
patent: 4051541 (1977-09-01), McGinnis et al.
IBM Technical Disclosure Bulletin, vol. 17, No. 1, Jun. 1974.

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