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Discrete Magnetic Recording System

IP.com Disclosure Number: IPCOM000077471D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Shew, LF: AUTHOR

Abstract

The magnetic recording system described employs the use of discrete magnetic tracks 4 separated by nonmagnetic guard bands 5. The use of discrete magnetic tracks has the advantage of providing an improved signal-to-noise ratio and allows isolation between adjacent data tracks on the magnetic media.

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Discrete Magnetic Recording System

The magnetic recording system described employs the use of discrete magnetic tracks 4 separated by nonmagnetic guard bands 5. The use of discrete magnetic tracks has the advantage of providing an improved signal-to-noise ratio and allows isolation between adjacent data tracks on the magnetic media.

The magnetic tracks are divided into servo sectors and data sectors, such as would be used in a sectored servo system.

Due to the discrete magnetic tracks, the servo information is obtained by using two separate servo heads 1 and 2. In the alternative, a single-tunnel head may be used for servo heads 1 and 2. Each servo head reads the servo information from a different discrete track. The servo information encoded within the servo sector can be of any one of a number of servo patterns whereby the contributions received by the respective servo heads are compared to obtain an error-position signal. The error-position signal causes the servo system to reposition the servo heads 1 and 2 and data head 3, such that data head 3 is reading approximately the center of a designated discrete track. The servo heads 1 and 2 are wider than the width of the discrete tracks and oppositely offset, as shown in Fig. 1. Thus, any lateral movement of the servo heads will result in a repositioning signal, which is an indication of the magnitude and duration of the lateral movement.

The three magnetic transducers 1, 2 and 3 may be an integral part of a sing...