Measurement of disc servo head/data head misalignment

Details Measurement of disc servo head/data head misalignment Measurement of disc servo head/data head misalignment

1980-12-24

1983-02-01

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

360 77, G11B 2110

Patent

active

043719600

ABSTRACT:
Compensation for radial misalignment between a data head and a servo head is provided. At least one pair of servo data tracks having a servo null there between are written on each data surface. The servo head is moved to a corresponding servo track null and the offset of the data head from its servo track null is measured iteratively by injecting voltages generated by a digital-to-analog converter into the servo head servo loop to progressively decrease the offset of the data head from its servo null until the data head is positioned over the servo null. The digital value of the digital-to-analog converter input is then stored in a digital memory for later use in fine positioning of the data head over a data track by means of retrieving the digital value from memory, converting it to a voltage through the digital-to-analog converter and injecting it into the servo head servo loop.

REFERENCES:
patent: 3994016 (1976-11-01), Moghodon
patent: 4135217 (1979-01-01), Jacques
"Correction of Data Track Misregistration in Servo Controlled Disk Files", by Paton, IBM Tech. Disc. Bull., vol. 17, No. 6, Nov. 1974.

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