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Servo Technique for Metallic Thin Film Magnetic Storage Disks

IP.com Disclosure Number: IPCOM000043821D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Brunsch, A: AUTHOR [+4]

Abstract

During the operation of magnetic storage disks, servo tracks ensure that the magnetic head for reading and writing is kept on and aligned to the respective data track selected. A servo technique is proposed which does not require special surface areas of the magnetic storage disks for the servo tracks nor a special servo magnetic head. Envisaged are magnetic storage disks which are coated with a thin wear-resistant overcoat of SiO2 or Si3N4 . In this overcoat, electron traps are generated by implanting Ge over the entire surface without using masks. The servo tracks are defined by locally and permanently charging these electron traps with electrons. Charging is effected by means of the magnetic head (e.g.

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Servo Technique for Metallic Thin Film Magnetic Storage Disks

During the operation of magnetic storage disks, servo tracks ensure that the magnetic head for reading and writing is kept on and aligned to the respective data track selected. A servo technique is proposed which does not require special surface areas of the magnetic storage disks for the servo tracks nor a special servo magnetic head. Envisaged are magnetic storage disks which are coated with a thin wear-resistant overcoat of SiO2 or Si3N4 . In this overcoat, electron traps are generated by implanting Ge over the entire surface without using masks. The servo tracks are defined by locally and permanently charging these electron traps with electrons. Charging is effected by means of the magnetic head (e.g., through an electrode on the slider), to which a voltage of 10 - 50 volts is applied, while the magnetic storage disk is at ground potential. For refreshing the charge of the electron traps, the charge process may be repeated after several months of system operation. During reading or writing, the servo tracks thus generated can be capacitively sensed, independently of the actual data tracks. As the servo tracks are arranged on the very disk surface, track adjustment is effected with a high degree of sensitivity.

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