Magnetic disc storage devices having compensation for dimensiona

Details Magnetic disc storage devices having compensation for dimensiona Magnetic disc storage devices having compensation for dimensiona

1977-07-06

1979-01-23

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

318634, G11B 2108

Patent

active

041363655

ABSTRACT:
In a magnetic-disc data storage device using exchangeable discs for the recording of data on circular tracks, a reference track is provided on the disc and during interruptions in the transfer of data, a read-write head is moved to the reference track and the error in its expected position, due to dimensional changes in the disc or the storage device or due to misalignment of the head, is measured. In subsequent data tracks access the position of the head is corrected by error measured so that the head is correctly aligned with the selected data track. Measurement of the error is carried out more frequently when the error is changing rapidly.

REFERENCES:
patent: 3775655 (1973-11-01), Du Vall

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