| 摘要 |
A direct access storage device includes a base, a spindle and a hub supporting at least one data storage disk. The hub is mounted for rotation about the spindle by a motor having a bearing assembly. The device also preferably comprises an enclosure which contains the spindle and the hub. An annular member is secured to the hub and surrounds the spindle. The annular member has an upper and lower portion defined by a radial cavity which is open to the spindle. The lower portion is closer to the bearing assembly than the upper portion. The upper portion is exposed to ambient gas within the enclosure. Each of the upper and lower portions have an inside diameter surface facing the spindle with a gap therebetween. The upper portion has a vent hole in fluid communication with the radial cavity. The vent hole is positioned away from the end to the radial cavity to define a containment volume. The gap between the inside surface of the upper portion and the spindle is larger than the gap between the inside surface of the lower portion and the spindle. The gap between the inside surface of the upper portion and the spindle accommodates passage of gas therebetween. The gas passes between the inside surface of the upper portion and the spindle, into the radial cavity and through the vent hole.
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