Patent ID: 8638524
Filing Date: 2014-01-28
Classification: B01D,G11B

Abstract:
1. A hard-disk drive (HDD), comprising: a sealed enclosure that is filled with a substantial helium gas; a magnetic-recording head; a magnetic-recording disk rotatably mounted on a spindle; a drive motor having a motor shaft attached to said spindle for rotating said magnetic-recording disk; a voice-coil motor configured to move said magnetic-recording head to access portions of said magnetic-recording disk; a shroud that surrounds a majority of the perimeter of the magnetic-recording disk; an upstream spoiler having one or more wings, wherein the shape of the upstream spoiler directs a flow of the substantial helium gas that circulates when the magnetic-recording disk is rotating to a plenum chamber; the plenum chamber, wherein the plenum chamber has a mouth that allows a portion of the circulating flow of substantial helium gas to flow therein, wherein the mouth of the plenum chamber is a gap in the shroud that is prior to the upstream spoiler in the circulating flow of the substantial helium gas; a particle filter having a longitudinally curved shape with a curvature greater than a curvature conforming to components with which the particle filter is coupled at each end, the greater curvature providing a helium pressure differential across the particle filter that is greater than a helium pressure differential that would otherwise be provided with a particle filter having a curvature conforming to the components with which the particle filter is coupled; and wherein a portion of the plenum chamber is formed using the particle filter opposing the gap.