Patent ID: 8027116
Filing Date: 2011-09-27
Classification: G11B

Abstract:
1. A method of manufacturing of a hard-disk drive using a bulk eraser for erasing recorded information on a magnetic-recording disk, said method comprising: providing a bulk eraser having a gap consisting of at least a first portion providing a depth and a second portion providing a height, the bulk eraser producing magnetic-flux density in the second portion of a gap sufficient to erase recorded information from a portion of said magnetic-recording disk, a hard-disk drive having an enclosure, a disk-stack having at least one magnetic-recording disk rotatably mounted on a spindle, and a drive motor having a rotor attached to said spindle for rotating said magnetic-recording disk inside said enclosure; configuring a plurality of magnets and a structure of said bulk eraser such that magnetic-flux density is oriented substantially parallel to a central plane in said second portion of said gap and in a substantially radial direction of said portion of said magnetic-recording disk when said hard-disk drive is inserted into said second portion of said gap; rotating said magnetic-recording disk in said hard-disk drive; inserting said hard-disk drive into said second portion of said gap of said bulk eraser such that a plane of said magnetic-recording disk of said hard-disk drive is oriented substantially parallel to said central plane in said second portion of said gap such that magnetic-flux density is oriented in said substantially radial direction of said portion of said magnetic-recording disk; erasing recorded information from said portion of said magnetic-recording disk in said hard-disk drive located in said second portion of said gap; and removing said hard-disk drive from said second portion of said gap.