Buffered recording

Details Buffered recording Buffered recording

1979-09-20

1981-11-03

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

360 48, 360 63, 360 77, 360 78, G11B 509, G11B 512, G11B 2108, G11B 2110

Patent

active

042988977

ABSTRACT:
A forward/backward compatible apparatus and record member achieves multiple density by multiple track widths as well as multiple lineal densities. In a rotating head recorder a single head has a wide write gap followed by a plurality of narrow read gaps. In recording, narrower tracks--i.e., higher densities, the record medium is moved less than the width of the write gap for recording narrower tracks. The narrower tracks have the same width as the trailing read gaps. During readback, all read gaps are simultaneously operative. Signals from one of the read gaps are processed immediately, while signals from the remaining read gaps are buffered until a dead time occurs, such signals are then processed. The same principles are applicable to magnetic card and magnetic disk recorders. A record member of the disclosure employs a table of contents area always recorded at the lower density--i.e., widest track. The table of contents contains indicia indicating the track density as well as the lineal density of the other recording areas. The buffering also is employed to overlap seeks in a disk file for greater data accessibility.

REFERENCES:
patent: 3480931 (1969-11-01), Geissler et al.
patent: 3487374 (1969-12-01), Droux
patent: 3641502 (1972-02-01), Whitehead
patent: 3751599 (1973-08-01), Ogawa et al.
patent: 3869721 (1975-03-01), Kooda
patent: 3932894 (1976-01-01), Arter et al.
patent: 3986209 (1976-10-01), Beecroft et al.
patent: 3994019 (1976-11-01), Sagishima
patent: 4011587 (1977-03-01), Arter et al.
patent: 4068268 (1978-01-01), Idemoto et al.
patent: 4183066 (1980-01-01), Anderson
patent: 4231071 (1980-10-01), Anderson
IBM Technical Disclosure Bulletin, vol. 21, #12, May 1979, Arter et al., "Recording".
Patent Abstract of Japan, vol. 3, No. 86, Jul. 24, 1979, p. 68E125; application 54-65012.

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