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Researchers Find Technique to Quickly Erase Hard Drives - TechAmok
Researchers Find Technique to Quickly Erase Hard Drives - [technology] 07:45 PM EDT - Jun,17 2006 - post a comment Scientists at the Georgia Institute of Technology (Atlanta), working with L-3
Communications Corp. (New York), said
they have developed a technique for quickly erasing hard-disk drives. The
team reports development of a prototype fast-erasure system to prevent sensitive
information from reaching enemy eyes.
The researchers concluded that permanent magnets are the best solution. Other
methods, including burning disks with heat-generating thermite, crushing drives
in presses, chemically destroying the media or frying them with microwaves all
proved susceptible to sensitive, patient, recovery efforts.
Permanent magnets for erasing magnetic media have been available since the dawn
of disk drives, but the team found that commercial systems were either
magnetically too weak, too large and heavy or could not meet air-safety
standards. Instead, the team crafted a new generation of super-powerful magnets
to penetrate hard disk enclosures to quickly erase magnetic media. Special
high-strength magnets as powerful as those in medical imaging equipment proved
sufficient for permanently erasing all information on a disk drive in a single
pass.
To create a magnetic field strong enough to penetrate the metal housing around a
disk drive and erase the magnetic media inside, the researchers designed a
neodymium iron-boron magnet with special pole pieces made of esoteric cobalt
alloys. A motorized mechanism pushed disk drives past the magnets; a back up
twist-knob allows operators to manually pull drives through the magnetic field.
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