Patent ID: 8363354
Filing Date: 2013-01-29
Classification: G11B,H01F

Abstract:
1. A bulk eraser for erasing recorded information on a magnetic-recording disk, said bulk eraser comprising: a plurality of magnets comprising: a structure magnetically coupled with said plurality of magnets to produce magnetic-flux density in a gap, wherein said gap has a first portion, a second portion and a third portion and wherein two magnets are disposed with opposing polarity across said first portion of said gap; wherein said plurality of magnets and said structure are configured to produce a magnetic-flux density in said second portion of said gap sufficient to erase recorded information from a portion of at least one magnetic-recording disk in a disk-stack of said hard-disk drive when said hard-disk drive is inserted into said second portion of said gap; and wherein said plurality of magnets and said structure are configured to direct said magnetic-flux density in a substantially radial direction of said portion of said magnetic-recording disk in said hard-disk drive in said second portion of said gap.