> I want to sell an old machine that I don't use any more but there's
> still sensitive stuff like personal emails, gpg keys, and passwords on
> the hdd. What's the recommended way to securely 'shred' this data so
> that it cannot be undeleted by the next owner?
> I assume I need to do something like overwriting the whole drive
> serveral times with random data before finally erasing and reformating
> the whole drive. Are there any apps out there that do this or do I have
> to roll my own solution using something like "cat /dev/urandom | dd"?
> Any suggestions?
> Any pointers and suggestions appreciated.

# mke2fs -c -c /dev/hda1
will make any undeletion (not involving very expensive recovery hardware)

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