[unisog] Wiping hard drives before computer transfer
heinlein at cse.ogi.edu
Fri Jan 24 16:54:59 GMT 2003
> It is free and can clean a 120G 7200rpm in 27-30 hours for a 35 pass
> overwrite (call me Mister Clean ;-) ) using a 1.7 GHz P4.
Peter Gutmann, the apparent originator of the 35-pass overwrite
technique, has written a good academic treatment of the subject:
He makes the point that you really ought to know the type of encoding
used on the drive before trying to scrub it:
If you're using a drive which uses encoding technology X, you only
need to perform the passes specific to X, and you never need to
perform all 35 passes. For any modern PRML/EPRML drive, a few
passes of random scrubbing is the best you can do.
Just trying to complicate things,
--Paul Heinlein <heinlein at cse.ogi.edu>
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