Track servoing system using signals from tunnel erase heads

Details Track servoing system using signals from tunnel erase heads Track servoing system using signals from tunnel erase heads

1978-04-11

1979-08-14

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 66, 360118, 360121, G11B 502, G11B 2110, G11B 527

Patent

active

041647815

ABSTRACT:
A track servoing system is disclosed which is particularly useful with floppy disk memories. The system improves the positioning accuracy of a read/write head during a reading operation through the use of tunnel erase heads as read heads. The tunnel erase heads are positioned on either side of the read/write head and their outputs are differentially measured to provide direction and magnitude information to servo positioning electronics. The invention is particularly reliable in reading eccentric variations in data tracks caused by environment, i.e., humidity, temperature, etc.

REFERENCES:
patent: 3246307 (1966-04-01), Stanley
patent: 3541270 (1970-11-01), Walther
patent: 3852812 (1974-12-01), Reisfeld
patent: 4055849 (1977-10-01), Hickok

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