A technique for the measurement of track misregistration in disk files

The authors describe a noninvasive technique for measuring track misregistration (TMR) in disk files using variations in read signal amplitude as an indicator of relative motion between the read head and the written track. The readback signal amplitude from a magnetic recording head can be used as a...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1991-11, Vol.27 (6), p.5304-5306
Main Authors: Chainer, T.J., Yarmchuk, E.J.
Format: Article
Language:English
Subjects:
Amplitude modulation
Applied sciences
Electronics
Exact sciences and technology
Magnetic and optical mass memories
Magnetic heads
Magnetic noise
Magnetic recording
Motion measurement
Noise level
Noninvasive treatment
Position measurement
Storage and reproduction of information
Tracking
Transducers
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Summary:The authors describe a noninvasive technique for measuring track misregistration (TMR) in disk files using variations in read signal amplitude as an indicator of relative motion between the read head and the written track. The readback signal amplitude from a magnetic recording head can be used as a sensitive linear position transducer for measuring dynamic head-to-track misregistration in disk files. Subtracking the repeatable part of the signal amplitude eliminates virtually all non-TMR related modulation, leaving only small contributions from electronics noise and nonrepeatable fly height fluctuations. These error terms can be measured in isolation by locating the head directly on-track, where sensitivity to TMR vanishes. This technique can provide detailed information about the electromechanical performance of completely assembled and installed disk files.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.278820