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Friction Test for Magnetic Recording Disk Files

IP.com Disclosure Number: IPCOM000043666D
Original Publication Date: 1984-Sep-01
Included in the Prior Art Database: 2005-Feb-05
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Ertingshausen, F: AUTHOR [+5]

Abstract

An accelerated friction test for a system consisting of a magnetic head and a magnetic disk is based on the analysis of the time dependence of the frictional force. Life forecasts for systems under normal operating conditions, using data obtained during accelerated testing, necessitate that the breakdown mechanisms are identical in either case. Generally, a correlation is only possible if the triboelements involved are not changed and the operating variables are changed only slightly. Thus, accelerated wear tests at increased contact pressure between magnetic head and magnetic disk do not provide readily usable data on the behavior of such systems under normal conditions. Most systems are subject to wear, however slight, already at a very early stage during normal operation.

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Friction Test for Magnetic Recording Disk Files

An accelerated friction test for a system consisting of a magnetic head and a magnetic disk is based on the analysis of the time dependence of the frictional force. Life forecasts for systems under normal operating conditions, using data obtained during accelerated testing, necessitate that the breakdown mechanisms are identical in either case. Generally, a correlation is only possible if the triboelements involved are not changed and the operating variables are changed only slightly. Thus, accelerated wear tests at increased contact pressure between magnetic head and magnetic disk do not provide readily usable data on the behavior of such systems under normal conditions. Most systems are subject to wear, however slight, already at a very early stage during normal operation. Thus, by using subtle measuring methods during the test cycle, it is possible to achieve results that make it unnecessary for the systems to be tested until breakdown and that are sufficiently conclusive as to their long-term behavior. Sliding tests of the magnetic head on the magnetic disk at a constant number of revolutions showed that premature wear can already be detected at a relatively early stage, if the frictional force is monitored as a function of time. In other words, there are short frictional peaks, whose number is indicative of the life of the head and disk. During the test cycle, the magnetic disk to be tested rotates at a low spe...