Method and apparatus for measuring bit shift

Dynamic magnetic information storage or retrieval – General processing of a digital signal – Pulse crowding correction

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360 31, G11B 509

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active

050687549

ABSTRACT:
A method and apparatus for measuring aggregate bit shift (peak shift) timing error in the readback signal of a magnetic storage system. The method provides an effective measure of the relative goodness of one magnetic head with respect to another magnetic head. A repetitive data pattern is written onto a magnetic disk. The magnetic head under test reads back the magnetic transitions from the disk. The signals are amplified, detected and digitized. A low cost gating system synchronizes to the recorded data pattern and outputs a pulse at the beginning and end of a selected period corresponding to two transitions in the data pattern. A time interval measuring device connected at the output of the gating system determines the average time or time variance between the beginning and end data pulses. The average time value correlates to the aggregate bit shift inherent in the magnetic read head being measured. This relatively simple system provides fast, low cost, accurate bit shift measurement.

REFERENCES:
patent: 3686682 (1972-08-01), Behr et al.
patent: 4612586 (1986-09-01), Sordello et al.
patent: 4799112 (1989-01-01), Bremmer et al.
"Phase Margin Analysis is Critical to Disk-Drive Test", Oct. 1989; Electronic Test Magazine, pp. 30-32, 38.

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