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Radial Field Buried-Servo Scheme

IP.com Disclosure Number: IPCOM000052267D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Nayak, JH: AUTHOR

Abstract

In a track-following servo system for a magnetic disk file, buried-serv information is recorded with the record head gap aligned parallel to a tangent to the disk, thus creating a radial field instead of the conventional tangential field. The servo information is then read with the servo read head gap aligned tangentially. Data is written and read with head(s) gap aligned radially in the conventional manner.

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Radial Field Buried-Servo Scheme

In a track-following servo system for a magnetic disk file, buried-serv information is recorded with the record head gap aligned parallel to a tangent to the disk, thus creating a radial field instead of the conventional tangential field. The servo information is then read with the servo read head gap aligned tangentially. Data is written and read with head(s) gap aligned radially in the conventional manner.

The servo read head and data read/write head(s) may be thin film heads on one single slider, thus permitting greater accuracy in servoing. For good resolution the "width" of the servo write and read head should be a fraction of the wavelength recorded. The advantages of this system are: 1. The data head will not sense the servo field, and the servo read head will not sense the data field. This eliminates the interference between data and servo signal, and the need for filtering is avoided. 2. Data recording and reading are done in the conventional way, permitting maximum bit density. 3. Since the servo head and the data head are on a single slider, servoing accuracy is improved.

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