Variable-phase servo burst pattern used to minimize shield-relat

Details Variable-phase servo burst pattern used to minimize shield-relat Variable-phase servo burst pattern used to minimize shield-relat

1997-09-30

1999-07-13

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 75, G11B 5596

Patent

active

059234920

ABSTRACT:
A disk which incorporates a variable-phase servo burst pattern is disclosed. The disk has servo information thereon. The servo information includes a first servo burst pattern written on a first track and a second servo burst pattern written on a second track. Both the first servo burst pattern and the second servo burst pattern have a plurality of transition pulses. The corresponding transition pulses of the first servo burst pattern and the second servo burst pattern are 180 degrees out of phase from one another. Furthermore, a method of writing servo-information which is used to position a magneto-resistive head on a centerline of a track is also disclosed. The method includes the steps of (1) writing a first servo burst pattern on a first track, the first servo burst pattern having a plurality of transition pulses; and (2) writing a second servo burst pattern on a second track, the second servo burst pattern having a plurality of transition pulses, wherein the corresponding transition pulses of the first servo burst pattern and the second servo burst pattern are 180 degrees out of phase from one another.

REFERENCES:
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patent: 5544135 (1996-08-01), Akin, Jr. et al.
patent: 5739972 (1998-04-01), Smith et al.
Feng, "Cross Talk in Shielded Magnetoresistive Sensors" (no date).
Shi et al., "Shield-Related Side Reading in MR Heads" (no date).
Min et al., "Track Position Dependence of Performance Attributes in Permanent Magnet Biased MR/SAL Heads," IEEE Transactions on Magnetics, p. 67-73, vol. 32, No. 1 (Jan. 1996).
Zhu et al., "Narrow Track Recording Characteristics in Thin Film Media," IEEE Transactions on Magnetics, pp. 984-989, vol. 33, No. 1 (Jan. 1997).

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