Method for measuring timing asymmetry in a magnetic storage syst

Details Method for measuring timing asymmetry in a magnetic storage syst Method for measuring timing asymmetry in a magnetic storage syst

1984-06-05

1986-09-16

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 25, 360 45, G11B 2736, G11B 1502, G11B 509

Patent

active

046125868

ABSTRACT:
A method for measuring bit shift, timing asymmetry and other characteristics indicative of the performance of a magnetic storage system, particularly for a system employing a thin-film magnetic head. In a preferred embodiment, complementary patterns are written many times around a circular track of a magnetic disk, each pattern including relatively closely spaced magnetic transitions as well as relatively widely spaced magnetic transitions. The relatively widely spaced transitions are chosen so as to be substantially unaffected by any other transitions. Measurements are made with reference to these widely spaced transitions and averaged for the many patterns recorded in the track so as to rapidly provide highly reliable measurements indicative of system performance.

REFERENCES:
patent: 3947875 (1976-03-01), Bull et al.
patent: 4009490 (1977-02-01), Fassbender
patent: 4333177 (1982-06-01), Sutterlin

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