> > Shredding it will overwrite the file about 20 times making it > > impossible to recover. > > Why 20 times? How is it possible to recover a file that has been > overwritten once?
I imagine that if you measure the 1's and 0's with a device that takes an analog reading, you can tell wether it was previously a 1 or a 0. I could see this possibly working for a few iterations. I think i also heard that each time a a write takes place, the location radially is not perfect, so if you look at the edges you can see preious data. Presumably in normal use the read head looks at a narrower path than the write head. Not sure which (if either) method is valid... -- Mandrake HowTo's & More: http://twiki.mdklinuxfaq.org Join the content organization discussion: http://mandrake.vmlinuz.ca/bin/view/Main/WebIndex Join the General Wiki Development discussion: http://mandrake.vmlinuz.ca/bin/view/Main/DevelopingTheMandrakeCommunity#Discussion
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