Method and apparatus for measuring dynamic track misregistration

Details Method and apparatus for measuring dynamic track misregistration Method and apparatus for measuring dynamic track misregistration

1988-02-22

1990-07-03

Stephan, Steven L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

324226, G11B 3310

Patent

active

049395998

ABSTRACT:
A method and apparatus for measuring dynamic head and track misregistration in, for example, a magnetic disk file. A reference signal waveform is recorded onto a track on a recording medium. The track has a center line and an off-center line parallel to the center line. The recorded reference signal waveform is read a plurality of times with the transducer centered approximately above the off-center line of the track to produce a plurality of off-track playback signal waveforms. A track misregistration signal waveform is produced by computing the difference between one off-track playback signal waveform and the average off-track playback signal waveform.

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Prater, "Testing Ball Bearings can Prevent Noise in Head/Disk Assemblies", Computer Technology Review, Winter 1984, pp. 65, 68-70.
Klein, "The Asynchronous Runout of Spindles", Mechanical Signature Analysis, Machinery Vibration, Flow-Induced Vibration, and Acoustic Noise Analysis-DE-vol. 7, ASME, Sep. 1987, pp. 95-99.
Richter et al., Nonrepeatable Radial and Axial Runout of 51/4" Disk Drive Spindles, IEEE Transactions on Magnetics, vol. 24, No. 6, Nov. 1988.
Shi et al., "Use of Readback Signal Modulation to Measure Head/Disk Spacing Variations in Magnetic Disk Files", The Center for Magnetic Recording Research, I. of CA, San Diego, Tech. Rpt. #11, (1985).

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