Dynamic magnetic information storage or retrieval – Record medium – Disk
Patent
1992-11-23
1993-08-31
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Record medium
Disk
360128, 360 21, 360 76, 360 7706, G11B 582, G11B 502
Patent
active
052414426
ABSTRACT:
In the present alignment disk for adjusting the tracking and azimuth of a magnetic head, a track includes adjacent first and second regions which are circular and substantially concentric. First data and second data are recorded on the first region of the track at first and second angles with respect to a width direction of the track, respectively. Third and fourth data are recorded on the second region at third and fourth angles with respect to the width direction, respectively. The tracking and azimuth are adjusted on the basis of the voltage level relation between the output signals, which correspond to the first and third data and the first and second data readout by a magnetic head.
REFERENCES:
patent: 2938962 (1960-05-01), Konins et al.
patent: 3185972 (1965-05-01), Sippel
patent: 3665118 (1972-05-01), Cooper, Jr.
patent: 4314290 (1982-02-01), Ragle
patent: 4608618 (1986-08-01), Sturtevant-Stuart
IBM Technical Disclosure Bulletin vol. 20 No. 5 Oct. 1977 Read/Write Magnetic Azimuth Adjustment Method, Hart et al.
A preprint of 1986 National Meeting of Electronics and communications Engineers of Japan, p. 7--This document shows a specification on an alignment disc for a high-density floppy disc apparatus. An explanation is given of a di-bit system underlying this invention, but the contents per se of the invention are never disclosed there.
An English translation of preprint of 1986 National Meeting of Electronics and communications Engineers of Japan, Fujiki et al.
Kabushiki Kaisha Toshiba
Sniezek Andrew L.
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