Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
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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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).
Chainer Timothy J.
Yarmchuk Edward J.
International Business Machines - Corporation
Robertson David L.
Schechter Marc D.
Stephan Steven L.
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