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Method for Collecting Magnetic Contaminants

IP.com Disclosure Number: IPCOM000049787D
Original Publication Date: 1982-Jul-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Eisenmann, DE: AUTHOR [+3]

Abstract

Head crashes and data erasures in disk storage drives are often the result of magnetic particle contaminants. The present method provides a way for collecting these magnetic particle contaminants to facilitate their analysis, which can lead to the identification of their source and thereafter their elimination by either changes in design, material composition or manufacturing techniques.

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Method for Collecting Magnetic Contaminants

Head crashes and data erasures in disk storage drives are often the result of magnetic particle contaminants. The present method provides a way for collecting these magnetic particle contaminants to facilitate their analysis, which can lead to the identification of their source and thereafter their elimination by either changes in design, material composition or manufacturing techniques.

The method consists of forming a magnetic particle collector by encapsulating a SmCO(5) magnet in an epoxy to prevent further magnetic particle contamination and bonding the coated magnet to the end of a non- magnetic rod, such as a glass rod. A glass rod is preferable because the possibility of fragments breaking loose from it and further contaminating the disk storage drive to be sampled is remote.

The collector is manually swept over surfaces of the disk storage drive under investigation in a manner that the magnetic field of the collector can attract magnetic particles to the magnet. An overlapping zig-zag pattern of sweeping has been found to be effective. After a particular surface has been swept, the magnet is removed from the glass rod and fixed to a specimen mount end stored in a clean container for subsequent X-ray analysis.

This method for collecting magnetic particle contaminants is fast because large surface areas can be swept quickly. It enables very small particles in the 1 Mu to 4 Mu size range to be collected.

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