On Sun, Jul 12, 2015 at 7:18 PM, Rich Freeman <ri...@gentoo.org> wrote: >I think that assumes that the two get averaged together in some way >and cannot be separated. If you could determine the orientation of >individual magnetic domains it is possible that you might be able to >determine which ones are which. For example, if in a given location >you found 90% of the grains had one orientation, and 10% had another, >you might be able to infer that the 10% was the previous value of that >location.
Every bit on the disk will have this ghost inverse behind it. If you flip bits at random - what overwriting the drive with random data effectively does - then it's impossible to tell which ones were flipped recently and which ones were flipped before the last write. >That probably isn't practical with current technology, but I see no >reason that it should be impossible. Magnetic force microscopy has a resolution fine enough to read any disk that can be created - they're just really expensive. On Sun, Jul 12, 2015 at 8:50 PM, Thomas Mueller <mueller6...@bellsouth.net> wrote: >All that has been said on this thread supposes that the hard drive is still >readable and writable. On Sun, Jul 12, 2015 at 6:22 PM, R0b0t1 <r03...@gmail.com> wrote: >If you need to destroy a platter drive take it apart and sand the platters >(probably the easiest). If it's solid state heat the drive over 150C-250C for >an extended period of time or mechanically destroy the chips.
