Method and apparatus for eliminating apparent offset in the serv

Details Method and apparatus for eliminating apparent offset in the serv Method and apparatus for eliminating apparent offset in the serv

1986-05-02

1987-05-26

Stellar, George G.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 78, G11B 555, G11B 556

Patent

active

046690034

ABSTRACT:
This method and apparatus for eliminating apparent offset in the servo code adjacent to a guard band on a magnetic memory disc utilizes at least two phases of servo code per magnetic cell for seeking and track centering, or track following, operations and two phases or guard band code per magnetic cell. The two phases or guard band code are each either in phase or similarly out of phase with the respective phases of the servo code in individual magnetic cells.
Phase locking on a selected phase of guard band code is achieved by providing a synchronizing code in the guard band using an irregular pattern of guard band code, providing a timing signal count representing a cell count, for example, decoding the synchronizing code to provide an end of code signal and utilizing the end of code signal and a predetermined cell count signal to achieve phase locking on the correct phase of the guard band code.

REFERENCES:
patent: 4539607 (1985-09-01), Fujiki
patent: 4602304 (1986-07-01), Fultz

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