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Servo Disk with Overlapping Servo and Data Tracks

IP.com Disclosure Number: IPCOM000080206D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Comstock, RL: AUTHOR [+2]

Abstract

There is a class of servo systems which employ multilayer servo disks. Generally, the servo disk has a first layer with a high coercivity and a second layer with a low coercivity. Servo information is recorded on the high coercivity bottom layer and data is recorded on the low coercivity top layer. This is done so that the reading and writing of data will not affect the prerecorded servo information.

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Servo Disk with Overlapping Servo and Data Tracks

There is a class of servo systems which employ multilayer servo disks. Generally, the servo disk has a first layer with a high coercivity and a second layer with a low coercivity. Servo information is recorded on the high coercivity bottom layer and data is recorded on the low coercivity top layer. This is done so that the reading and writing of data will not affect the prerecorded servo information.

Decoupling is obtained between the data on the data layer and the servo information on the servo layer, by recording the servo information at 90 degrees from the data orientation. The flux sensing transducers for both the servo head and data head are obtained by recording the data information at 45 degrees from the direction of motion of the servo disk. Data head 1 and servo head 2 are positioned to obtain the maximum signal from their recorded layers on the same disk. Data head 1 is at a 45 degrees angle and the servo head 2 is at a 135 degrees angle.

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