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Elimination of Breather Holes in Magnetic Disk Files

IP.com Disclosure Number: IPCOM000036790D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Elser, KH: AUTHOR

Abstract

The continued trend in magnetic recording disk drives is to increase the areal storage density. This is being accomplished by increasing the linear recording density and the track density which, in turn, require the lowering of the head-flying height. Lower flying heights are feasible only by assuring contamination-free operation of the drive over its expected life time. Experience has shown that certain chemical contaminants and moisture, entering the disk enclosure through the air breather opening, can lead to head crashes or can cause hard read errors. The objective of this invention is to eliminate the need for having the air breather opening. This is accomplished by means of a low cost device which will allow equalization of the internal pressure with the barometric pressure outside the enclosure.

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Elimination of Breather Holes in Magnetic Disk Files

The continued trend in magnetic recording disk drives is to increase the areal storage density. This is being accomplished by increasing the linear recording density and the track density which, in turn, require the lowering of the head-flying height. Lower flying heights are feasible only by assuring contamination-free operation of the drive over its expected life time. Experience has shown that certain chemical contaminants and moisture, entering the disk enclosure through the air breather opening, can lead to head crashes or can cause hard read errors. The objective of this invention is to eliminate the need for having the air breather opening. This is accomplished by means of a low cost device which will allow equalization of the internal pressure with the barometric pressure outside the enclosure.

The breather openings are required to prevent mechanical distortions of the baseplate which would lead to track misregistrations of the read/write head. These distortions would be the result of air pressure difference between the inside and outside of the disk enclosure. In addition, a sealed box without breather openings could become contaminated by sucking air through the spindle bearings, carrying with it ball bearing lubricants and/or ferro-fluidic seal material. Air pressure differences are caused by internal heating of the air by operating the device, by changes in the atmospheric pressure and changes in al...