Method and device for testing units for processing magnetic disk

Details Method and device for testing units for processing magnetic disk Method and device for testing units for processing magnetic disk

1981-03-09

1984-07-03

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360137, G11B 2108, G11B 500

Patent

active

044582757

ABSTRACT:
The method of testing units for the processing of magnetic disks comprises the insertion of a suitably modified disk into the testing unit and the reading of this disk when operations controlled by a testing programme are carried out. The disk for testing is modified and has a plurality of concentric tracks recorded on one or both sides in such a way that the distance between two tracks is slightly greater than the distance between the tracks of standard disks. Only the central track coincides exactly with the corresponding central track of standard disks. After the modified disk has been inserted in the testing unit, the magnetic head is firstly positioned on the central track of the disk and then displaced on the tracks moving increasingly further from the central track. Taking into account the occurrence of cross-talk errors caused by the head as a result of the simultaneous interference of two adjacent tracks and the number of sectors of the disk on which the head causes this error, the value of the possible non-alignment of the head in respect of the nominal axis of the tracks and the possible eccentricity of the drive spindle are determined.

REFERENCES:
patent: 3641278 (1972-02-01), Kinjo et al.
patent: 3646261 (1972-02-01), Kinjo et al.
patent: 3742470 (1973-06-01), Ha et al.
patent: 4084201 (1978-04-01), Hack et al.
patent: 4164764 (1979-08-01), Joannou
IBM Technical Disclosure Bulletin, vol. 17, No. 11, Apr. 1975, Eccentricity Tolerant Head Alignment Check (D. E. Sibbers).
Patents Abstracts of Japan, vol. 4, No. 103, 23 Jul., 1980, p. 151 P 20.

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