getting garbage faster using FreeBSD?
Wilko Bulte
wb at freebie.xs4all.nl
Wed Feb 21 07:58:19 UTC 2007
On Wed, Feb 21, 2007 at 07:29:21AM +0000, Matthew Seaman wrote..
> Alan Amesbury wrote:
> > Ivan Voras wrote:
> >
> >> The obvious question - why don't you burn the tapes and hammer the disks? :)
> >
> > Ah, low-tech. I know it well. Still, the last time I did any data
> > destruction, I found a 4 Tesla magnet does wonders. Downsides:
> >
> > 1) Oxford's 90cm bore, helium-cooled magnets aren't that
> > common, perhaps because a 2000V/500A power source
> > is a bit expensive (solution doesn't scale).
>
> It ain't the PSU that's the expensive bit on a supercon magnet -- it's the
> liquid Helium. After all, once you've ramped the current in the coil up to
> $bignum amps, it just keeps going so long as the superconductors aren't
> allowed to heat up. LHe costs about the same as good whiskey, and you need
> gallons of the stuff every few weeks.
>
> > 2) The hard drive has a tendency to fly out of one's
> > hands while moving it through the lines of force
> > (solution requires some physical coordination).
>
> Hmmm.... a solenoid coil magnet has a field that is approximately dipolar.
> Forces vary as the inverse *cube* of the distance away from the center of
> the magnet. Move a centimeter too close and the drive will suddenly be
> ripped out of your hands harder than you can resist.
Sounds like what the military are experimenting with: magnetic rail gun.
> > It's primarily for item #1 that I hadn't mentioned this earlier, as most
> > readers of -STABLE users are probably looking for a more scalable solution.
I once had business with a customer from the military who wanted to
permanently decommision some disks. I proposed a main battle tank.
And, apparantly they saw the fun in that, they reported back that
gently rolling one over a disk indeed does the trick nicely.
So when you do not want your living room spoiled by a 4T magnet go and
find a surplus Challenger tank (when in the UK) or a M1A1 Abrams (when in
the US).
Plasma torches like found in car body repair shops also do it just fine.
--
Wilko Bulte wilko at FreeBSD.org
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