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Date: Thu, 19 Jul 2012 10:15:17 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: jhs@berklix.com, freebsd-questions@freebsd.org, postmaster@freebsd.org
Subject: Re: fsck on FAT32 filesystem?
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>  1) There's a _reason_ the gov't requires hard drives with anthing higher
>     than 'somewhat' classified data on them to be =physically= destroyed
>     before leving the secure area.

no. for modern hard drives it was already proved that

dd if=/dev/zero of=/dev/disk bs=1m

is enough to make data unreadable.

for very old drives it may not