Patent ID: 8379363
Filing Date: 2013-02-19
Classification: G11B

Abstract:
1. A bulk erase tool to erase a perpendicular media recording (PMR) disk of a disk drive comprising: a housing to receive the disk drive; and a first pair of magnets comprising a first magnet and a second magnet mounted in the housing to be positioned above the received disk drive to provide a magnetic field to erase the top side of the disk and a second pair of magnets comprising a third magnet and a fourth magnet mounted in the housing to be positioned below the disk drive to provide a magnetic field to erase the bottom side of the disk, wherein the first magnet and the third magnet are vertically aligned with one another, and are of relatively opposite polar to one another, wherein the second magnet and the fourth magnet are vertically aligned with one another, and are of relatively opposite polar to one another, and wherein the second pair of magnets are approximately pyramid-shaped magnets.