Dynamic magnetic information storage or retrieval – Monitoring or testing the progress of recording
Patent
1984-11-19
1986-11-11
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
Monitoring or testing the progress of recording
360 46, G11B 2736, G11B 509
Patent
active
046225994
ABSTRACT:
A write data transition detector is provided connected across a thin film write head and write current generator and is responsive to the fractional voltage drops across the head resulting from the fractional amperage currents passed by the write generator through the head. Circuits in the detector adjust the gain of the voltage difference across the head, remove voltage spikes induced by changes in current across the head and time the period between consecutive current reversals of sufficient magnitude. The timing is controlled by means of a hysteresis circuit which switches from an existing state to an alternate state only when there is a satisfactorily large reversal of current across the write head. A timing circuit connected with the hysteresis circuit capacitively times the length of the period the hysteresis circuit remains in its existing state and outputs a fault indication current when this period exceeds the maximum period between transitions allowed by the encoding scheme employed.
REFERENCES:
patent: 2530562 (1950-11-01), Blaney
patent: 2782262 (1957-02-01), Hammond, Jr. et al.
patent: 2789026 (1957-04-01), Nordyke, Jr.
patent: 2919968 (1960-01-01), Fernandez-Rivas et al.
patent: 3080560 (1963-03-01), Klehm, Jr. et al.
patent: 3288924 (1966-11-01), Baldwin
patent: 3315268 (1967-04-01), Edde
patent: 3559192 (1971-01-01), Schlossbauer
patent: 3588375 (1971-06-01), Martin
patent: 3604859 (1971-09-01), Ban
patent: 3617652 (1971-11-01), Krausse
patent: 3668310 (1972-06-01), Yano et al.
patent: 4203137 (1980-05-01), Beck et al.
patent: 4212702 (1980-07-01), Mizuguchi et al.
patent: 4268905 (1981-05-01), Johann et al.
patent: 4535371 (1985-08-01), Harr et al.
Canney Vincent P.
Storage Technology Corporation
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