I've been experimenting with encrypting drives with bioctl(8). The idea
is to be able to "shred" a drive once I've finished using it for a
particular purpose. Rather than using a keydisk, I'm experimenting with
using the a and d partitions of the same drive, a partition being 1MB,
and the d partition, using the rest of the disk space.
The risk of the a partition being read during normal operation is
accepted in this case. If the drive becomes unreadable for some reason,
the data would be retrieved from backups.
Would overwriting the a partition be sufficient to make the data in the
d partition unusable? Maybe dd /dev/urandom over the a partition three
times? This isn't for the system disk, but other external disks.
TIA,
--Bruce
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