On 18 August 2015 at 14:21, Adrian Mageanu <adrian.mage...@totalimex.com> wrote: > I can't remember where I read but there are ways to retrieve data after > a dd fill with zeroes or something else by using photorec and some > hardware forensic techniques. > > The only downside with dban and nwipe is that for relatively recent > large HDDs it takes ages to finish. > > A while back I gave away 2x400GB SATA2 disks and one disk took 37 hours > to wipe with dban.
If you're paranoid, I'd be spending more time getting past the hard-drive firmware and getting into the protected regions, and the "bad blocks" that the drive silently reallocated away from you, and making sure they're zeroed out as well. Those blocks, if any of them exist, will not only contain entire sectors of your data, but they will contain enough of your data that the error correcting codes are still sufficient for the hard drive firmware to have transparently hidden the fact it saw a bad bit or two, and silently copied that data to a new place and pretended it never happened. http://superuser.com/a/688764 And there's always firmware caches as well that might have bits of data in them to be concerned about. -- Kent KENTNL - https://metacpan.org/author/KENTNL _______________________________________________ Linux-users mailing list Linux-users@lists.canterbury.ac.nz http://lists.canterbury.ac.nz/mailman/listinfo/linux-users
