NDLI: Slider-disk clearance measurements in magnetic disk drives using the readback transducer

Content Provider	IEEE Xplore Digital Library
Author	Klaassen, K.B. van Peppen, J.C.L.
Copyright Year	1993
Description	Author affiliation: IBM Almaden Res. Center, San Jose, CA, USA (Klaassen, K.B.; van Peppen, J.C.L.)
Abstract	A method is described for noninvasively measuring the mechanical clearance between a head slider and the recording medium in magnetic storage devices. The method is based on detection of the pulse width of the output signal of the readback transducer. It is shown that a variation in clearance produces a proportional variation in pulse width. The proportionality factor can be determined by simulating the effect of the varying spacing loss on a digitized isolated impulse response typical for the head-disk combination under investigation. Instrumentation is presented that provides an analog output voltage which is a measure for the ratio (PW/sub xT) of athe pulse width at the x% level (PW/sub x/) and the repetition period (T) of the readback signal. With this instrumentation, the absolute slider-disk clearance can be determined by evacuating the air from the head-disk interface. The bandwidth of the instrumentation is such that clearance dynamics can also be measured. This allows the detection of glide defects, in situ in a fully operational storage device. Examples of these clearance and glide measurements are given for hard disk drives.
Starting Page	167
Ending Page	170
File Size	529893
Page Count	4
File Format	PDF
ISBN	0780312295
DOI	10.1109/IMTC.1993.382658
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1993-05-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Disk drives Space vector pulse width modulation Instruments Pulse measurements Mechanical variables measurement Magnetic heads Disk recording Magnetic recording Magnetic memory Transducers
Content Type	Text
Resource Type	Article

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