Optimum control of overwrite by record gap length selection

Details Optimum control of overwrite by record gap length selection Optimum control of overwrite by record gap length selection

1984-11-28

1987-02-10

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Head

Gap spacer

360118, 360 66, G11B 525, G11B 502

Patent

active

046427180

ABSTRACT:
Given that there is a limit to the extent to which a record head may be excited before its pole tips saturate (gap fuzziness) while overwriting a second set of information signals atop a first set of information signals recorded in a high coercivity recording medium, the present invention concerns the discovery that if the record gap is dimensioned to equal approximately the flux change length that corresponds with a 2 f signal (FCL.sub.2) recorded atop a 1 f signal, i.e. if the record gap is somewhere between about 0.7 and 1.5 times the flux change length associated with the 2 f signal, erasure of the 1 f signal (as well as other signals) will be most effective.

REFERENCES:
patent: 3049698 (1962-08-01), Thompson et al.
patent: 3564558 (1971-02-01), Tolman et al.
Patent Abstracts of Japan, vol. 8, No. 175, (P-294)(1612) 8/11/84, Feinwerktechnik & Messtechnik, vol. 88, No. 2, 3/80, Munich, (DE).
H. H. Gatzen: "Schreib-Lese-Kopfe fur Magnetplattenspeicher in konventioneller und Dunnfilm-Technologie", pp. 53-59.
IEEE Transactions on Magnetics, vol. 15, No. 6, 11/79, J. U. Lemke, "Ultra-High Density Recording with New Heads and Tapes", pp. 1561-1563.
Electronics International, vol. 55, No. 8, 4/82, J. Taranto, "Thin-Film Disks Drive Densities to New Highs", pp. 108-111.
Patent Abstracts of Japan, vol. 7, No. 38, (P-176)(1183), 2/16/83, Tijdschrift van het Nederlands Radiogenootschap, vol. 21, No. 1.
1/56, Eindhoven, (NL) W. K. Westmijze, "The Fundamentals of Magnetic Recording", pp. 1-15.

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