A magnetic disk apparatus includes magnetic disks stacked on a rotating shaft, arms supporting magnetic heads, a rotary actuator for moving the arms, and a housing forming at least a part of an arcuate-shaped shroud which substantially surrounds a portion of side surfaces of the magnetic disks so as...http://www.google.com/patents/US6898049?utm_source=gb-gplus-sharePatent US6898049 - Magnetic disk apparatus with air flow bypass channel
