Electricity: measuring and testing – Magnetic – Magnetic information storage element testing
Patent
1989-06-26
1990-12-18
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetic information storage element testing
360 25, G01R 3312, G11B 2736, G11B 5004
Patent
active
049789163
ABSTRACT:
A method and an apparatus are disclosed for determining or defining a magnetic information carrier (TAMB) which includes a plurality of tracks P each having a synchronization index (IND). In the method, (1) the synchronization index (IND) is located, which makes it possible to initialize (pulse I.sub.N) the sequence (SEQ.sub.1, SEQ.sub.2, . . . ) of the following successive operations, which are repeatable p times; (2) the entire surface of the track is first erased; (3) next, on this same surface, a succession of magnetic domains (A.sub.i, A.sub.i+1, A.sub.i+2, . . . ) is written; (4) at predetermined sampling times (t.sub.n, t.sub.n+1. . . ), with a predetermined sampling period T.sub.E, a signal S is read, which is a function of the magnetization inside each of the domains read at these times; and (5) the values of the current I and signal S are memorized.
REFERENCES:
patent: 3686682 (1972-08-01), Behr et al.
patent: 3781835 (1973-12-01), Dion et al.
Hewlett-Packard Journal, vol. 36, No. 11, (Nov. 1985), pp. 11-21, "Dynamic Testing of Thin Film Magnetic Recording Discs", Amstelveen, N. L., and Hodges, J. et al.
Combettes Christian
Lefebvre Rene
Bull S.A.
Strecker Gerard R.
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