Scrub free disk blocks
alan at lxorguk.ukuu.org.uk
Sun Aug 29 12:05:21 UTC 2010
> In any case, if someone wants your data that bad, it is time to dig out
> the old sledgehammer and physically destroy the disk. Otherwise, scrub
> and other secure erasure programs should be sufficient.
Programs that just write over the data a few times may or may not help
but you never know. A sledgehammer won't help you either if the person
who wants the data has resources.
Modern drives support a secure erase/wipe feature (see hdparm). It's
probably the best option you get short of doing what probably would have
been smartest - encrypting it at install time ;)
There is a school of security thought that beyond the point where it's
cheaper to send a guy round to see you carrying instruments of persuasion
the extra investment isn't actually useful...
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