Method of seamlessly recording circumferentially successive serv

Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head

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360 68, G11B 502

Patent

active

059461578

ABSTRACT:
The invention relates generally to rotating magnetic storage disk drive and, more particularly, to a method of seamlessly recording circumferentially overlapping servo bursts on a magnetic disk with successive passes of a write head that is guided by a servo track writer wherein the servo bursts are contained in at least two servo burst groups that each have at least one circumferential burst position which may contain a servo burst. The method comprises the steps of turning a write current ON while passing the write head over a current ramp region that does not contain servo data and is located in front of an "active" servo burst group that will be modified on this pass, modifying a servo burst in at least one circumferential position of the active servo burst group with the write current ON; turning the write current OFF while passing the write head over a current ramp region that does not contain servo data and is located in front of a "passive" servo burst group that will not be modified on this pass; and skipping over at least one circumferential burst position of the passive servo burst group with the write current OFF.

REFERENCES:
patent: 5241435 (1993-08-01), Saito et al.
patent: 5434725 (1995-07-01), Hirose et al.
patent: 5519546 (1996-05-01), Lewis
patent: 5867337 (1999-02-01), Shimomura

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