Erase head positioning method

Details Erase head positioning method Erase head positioning method

1992-11-13

1994-03-01

Shepperd, John

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

324212, G01R 3212

Patent

active

052911349

ABSTRACT:
A method for analyzing the relative spatial alignment of the erase head pole tips relative to the record head pole tips on a recording of a magnetic tape to be partially overwritten by providing, through first and second erase heads, successive momentary erase pulses of a predetermined time duration in a predetermined phase relation on a non-overlapping basis, wherein each erase head thereby erases recorded information while leaving portions of information therebetween on adjacent track pairs, and then reading or playing back the results of the erasure for analysis of the RF envelope of the erasing pattern by a waveform monitor or ferrofluidic techniques. The duration of the erasures and playback is such that the RF envelope includes at least one erasure from the first erase head and at least one erasure from the second erase head.

REFERENCES:
patent: 4321636 (1982-03-01), Lavz
patent: 4400809 (1983-08-01), Whitinger
patent: 4902971 (1990-02-01), Guzik et al.
patent: 4904938 (1990-02-01), O'Reilly et al.
patent: 5023548 (1991-01-01), McMorran
patent: 5047874 (1991-09-01), Yointoubiam

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