[snip ...]
> I was always under the impression that it was ok if you first
> write all 0s and then all 1s and then 0s and 1s and then 1s and
> 0s over the existing data. Although you don't know if the data
> has been moved around on the filesystem because of disk optimizing.
> I suppose you could use an encrypted file system. I don't know
> if you can do that on Linux, however.
For information on secure deleting of data from magnetic media look at:
http://ftp.sunet.se/pub/unix/security/secure_del.html
After having read the above, I believe that the best device to erase a hard
disk is a smelter...
Later,
John Cochran
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