Measurement method for the spacing fluctuation of a head slider in a magnetic disk drive

This paper presents a method for measuring the head slider spacing fluctuation induced by wavy deformation in a disk. The author's first experiment reveals that disk wavy deformation, which is considered to appear in building up a magnetic disk drive, shortens working life time. To supply a rel...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1987-09, Vol.23 (5), p.3450-3452
Main Authors: Ohtsubo, Y., Kawashima, N., Marumo, H.
Format: Article
Language:English
Subjects:
Cascading style sheets
Disk drives
Displacement measurement
Estimation theory
Fluctuations
Friction
Loss measurement
Magnetic films
Magnetic heads
Testing
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Summary:This paper presents a method for measuring the head slider spacing fluctuation induced by wavy deformation in a disk. The author's first experiment reveals that disk wavy deformation, which is considered to appear in building up a magnetic disk drive, shortens working life time. To supply a reliable disk drive, it is necessary to evaluate disk waviness after building up a disk drive. The simple and practical readback signal modulation (RSM) method was investigated here. The second experiments, including the measurement of the spacing loss effect in recording, reveal that spacing fluctuation, measured by the RSM method, is in good agreement with that estimated theoretically from the disk displacement waveform. It becomes possible to evaluate the head slider spacing fluctuation quantitatively after building up a disk drive.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.1987.1065222