Twin track vertical magnetic recording servo control method and

Details Twin track vertical magnetic recording servo control method and Twin track vertical magnetic recording servo control method and

1985-10-16

1986-09-23

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360135, G11B 556

Patent

active

046139150

ABSTRACT:
This invention utilizes a sectored servo control having dual servo tracks recorded in the servo sector. In addition, the servo sector track portions have been recorded with two 180.degree. flux reversals in each track's polarity. The tracks are generally recorded with DC recording current to set a uniform magnetic polarity. The current is switched twice, i.e., from positive and negative and back again or vice versa for each servo track within the servo sector interval. This permits separation of the sensor, amplifier and servo signal offset voltages from the main servo signal itself. Two samples of the servo control voltage are taken during the servo sector interval and the polarity reversal of the servo track is necessary to allow separation of the offset voltages from a variety of sources from the off track or servo error signal.

REFERENCES:
patent: 4559570 (1985-12-01), Schwartz

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