Track-Following Servo System Using a Center-Tapped Magnetoresistive Head and a Servo Pattern Slanted Relative to the Track Centerline
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
In magnetic recording disk files, a track-following digital servo technique to maintain the read/write head over the centerline of the data tracks can be incorporated by using a center-tapped magnetoresistive (MR) head and a servo pattern of slanted segments of constant frequency servo information. The use of center-tapped MR heads as servo heads in magnetic recording disk files is disclosed in U.S. Patents 3,918,091 and 4,012,781. Referring to Fig. 1, the centerline 10 of a typical data track in a magnetic recording disk file is illustrated, for purpose of convenience, as a straight line. Each data track, such as track 11, has associated with it a slanted servo segment 12 of prerecorded constant frequency servo information. The radial width of the servo segment 12 is the same as the width of the center-tapped MR head 14.