Access to floppy disk stack

Details Access to floppy disk stack Access to floppy disk stack

1975-12-08

1977-09-27

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 99, G11B 560, G11B 582, G11B 2504

Patent

active

040515419

ABSTRACT:
A method and associated apparatus for efficiently establishing a "self-sustaining" split in a rotating stack of floppy type storage disks in a form suitable for read/write transducing access. The formation of such splits is fully described in U.S. Pat. No. 3,936,800 to McGinnis et al. In the present method a partial split formed at one disk interface position is used as a stable reference for detecting the location of that interface position relative to a target address position. The form of the partial split is not suitable for storage transducing access. However, the partial split forms much more quickly than the self-sustaining split. If the deviation from the target position is zero the partial split is transformed directly into the self-sustaining fully accessible form by controlling internal ventilation pressure between the disks in accordance with said patent 3,936,880. If the deviation is not zero the mechanism forming the partial split (e.g., external air jet) is repositioned in small corrective increments thereby shifting the partial split and eventually reducing the deviation to zero (the deviation being redetermined after each increment of repositioning). Since the time required to form the partial split is much less than the time required to form a fully accessible split it follows that the average access delay, with such "trial-and-error" positioning and iterative determination of deviation, is significantly less than the time required otherwise for correctable positioning of a self-sustaining split.

REFERENCES:
patent: 3090626 (1963-05-01), Wadey
patent: 3130393 (1964-04-01), Gutterman
patent: 3618055 (1971-11-01), Van Acker et al.
patent: 3835998 (1974-09-01), Cobb et al.
patent: 3936878 (1976-02-01), Chrysler
patent: 3936880 (1976-02-01), McGinnis et al.

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