Alignment disk for magnetic head azimuth correction

Details Alignment disk for magnetic head azimuth correction Alignment disk for magnetic head azimuth correction

1990-08-15

1991-08-27

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Record medium

Disk

360 760, G11B 556, G11B 5455

Patent

active

050438379

ABSTRACT:
An azimuth adjustment disk having first and second areas alternately recorded in a circumfrential direction. Each of the first areas has two azimuth burst signal. The two azimuth burst signals have different azimuths and a first signal wavelength. While each of the second areas has two azimuth burst signals with azimuths corresponding to the bursts of the first areas, but which have a longer wavelength.

REFERENCES:
patent: 4097908 (1978-06-01), Chou et al.
patent: 4513331 (1985-04-01), Baker et al.
patent: 4694359 (1987-09-01), Oya
IBM TDB vol. 20, No. 5, "Read/Write Magnetic Azimuth Adjustment Method" Hart et al., 10/77, pp. 1897-1901.
Japanese Patent Application Laying Open Official Gazzette No. 60-50713 by Toshiba (Fujiki) Mar. 20, 1985 Azimuth Correcting Method.
"Barrium Ferrite Perpendicular Recording Floppy Disk," Toshiba Review No. 154, pp. 18-22, Winter 1985, Imanura et al.
"Alignment Disk For High Density Floppy Disk Drive," Great Meeting of Denki Tsushin Gakkai in 1986 1-180.

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