As Peter Gutmann
put it
Quote:
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Originally Posted by Secure Deletion of Data from Magnetic and Solid-State Memory (Epilogue)
As the paper says, "A good scrubbing with random data will do about as well as can be expected". This was true in 1996, and is still true now.
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If you've got /dev/urandom (or some similar source or "randomness") dd that to your disk. If it's not available, choose any pattern, and overwrite a second time using the complement number.
If you've got to delete HDDs often and/or want to be extra sure,
DBAN is very recommendable.
