Buried servo recording system using phase encoded servo pattern

Details Buried servo recording system using phase encoded servo pattern Buried servo recording system using phase encoded servo pattern

1982-11-01

1984-12-11

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

G11B 558

Patent

active

044881886

ABSTRACT:
A track following servo system for a magnetic disk file employs a buried servo pattern having two types of signals therein. The first is a reference signal of frequency f and the second type are control signals of frequency 2f, adjacent control signals being 180.degree. out of phase with each other.

REFERENCES:
patent: 3404392 (1968-10-01), Sordello
patent: 3765005 (1973-10-01), Cannon
patent: 3821798 (1974-06-01), Cannon
patent: 3956769 (1976-05-01), Beecroft et al.
patent: 4213148 (1980-07-01), Clemens
patent: 4286296 (1981-08-01), Cunningham
patent: 4318141 (1982-03-01), Haynes
patent: 4432026 (1984-02-01), Coleman, Jr.
"Recording Servo Information Below a Data Surface in a Homogeneous Medium", T. A. Schwarz; IBM Technical Disclosure Bulletin, vol. 17, No. 2 Jul. 1974, pp. 536-539.

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