Browse Prior Art Database

Track-Following Servo System Using a Center-Tapped Magnetoresistive Head and a Servo Pattern Slanted Relative to the Track Centerline

IP.com Disclosure Number: IPCOM000061364D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Kabelac, WJ: AUTHOR [+2]

Abstract

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.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 81% of the total text.

Page 1 of 2

Track-Following Servo System Using a Center-Tapped Magnetoresistive Head and a Servo Pattern Slanted Relative to the Track Centerline

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. Various radial positions of the MR head 14 with respect to the centerline 10 of track 11 are represented as A through E in Fig. 1. For track reading and writing it is necessary to maintain the read/write head directly positioned over the track centerline, which occurs when MR head 14 is in position C. As the MR head 14 passes over the segment 12, the two MR sections 16, 18 produce the readback envelopes shown in Fig. 2, each envelope corresponding to a respective radial position A through E. A digital head positio...