Addition of Carbon Dioxide and Water Vapor to Helium Atmosphere in a Hermetically Sealed Magnetic Recording Disk File
Original Publication Date: 1985-Jul-01
Included in the Prior Art Database: 2005-Feb-18
A hermetically sealed magnetic recording disk file which is filled with helium, rather than air, results in substantially less heat generation during operation because of the relatively low density helium gas. In addition, the helium allows the head to fly at a reduced height above the disk, which permits increased linear recording density. A relatively low humidity level in the helium atmosphere is proposed to effect minimal frictional wear of moving parts in the operating disk file, including the head-disk interface. Small amounts of water vapor and carbon dioxide can be added to the helium in the sealed disk file to minimize the frictional wear while still permitting good thermal conductivity and lower head flying height.