Electricity: measuring and testing – Magnetic – Magnetic information storage element testing
Patent
1998-03-27
2000-11-14
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetic information storage element testing
360 31, 365 58, G01N 2776, G01R 3312
Patent
active
061474886
ABSTRACT:
A testing method for a magnetic recording medium which is magnetized measures variation of magnetization with the passage of time and evaluates the magnetic recording medium over its life. The method includes the steps of recording a first pattern at a density to be guaranteed in the magnetic recording medium, the first pattern having a difference between the sum total of areas of +bits and the sum total of areas of -bits, measuring remanence of the first pattern with the passage of time, and evaluating the magnetic recording medium over its life based on a measurement result.
REFERENCES:
patent: 4641093 (1987-02-01), Melgui et al.
Bamba Yasuo
Okamoto Iwao
Yamagishi Wataru
Yamanaka Kazunori
Fujitsu Limited
Snow Walter E.
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