I should have brought up the increased density problem Valdis, excellent points.
-Travis On Tue, Jan 26, 2010 at 1:26 PM, <[email protected]> wrote: > On Tue, 26 Jan 2010 11:11:52 EST, T Biehn said: >> Overwritten files require analysis with a 'big expensive machine.' > > Assuming a disk drive made this century, if the block has actually been > overwritten with any data even *once*, it is basically unrecoverable using any > available tech. > > Proof: In a decade of looking, I haven't found a *single* data-recovery outfit > that claimed to recover from even a single overwrite. Blown partition table? > No problem. Metadata overwritten, data not? We can scavenge the blocks. Disk > been in a fire? Flood? Run over by truck? Sure. We can go in and scavenge the > individual intact bits with big expensive machines. Overwritten? <crickets>. > > Seriously - lot of companies can recover data by reading the magnetic fields > of > intact data. But anybody know of one that claims it can recover actual > over-writes, as opposed to "damn we erased it" or "damn the first part of the > disk is toast"? > > No? Nobody knows of one? I didn't think so. > > 20 or 25 years ago, it may still have been feasible to use gear to measure the > residual magnetism in the sidebands after an over-write. However, those > sidebands have shrunk drastically, as they are the single biggest problem when > trying to drive densities higher. You can't afford a sideband anymore - if > you have one, it's overlapping the next bit. > > There *may* be some guys inside the spook agencies able to recover overwrites. > But you don't need to worry about any evidence so recovered ever being used > against you in a court of law - as then they'd have to admit they could do it. > Just like in WWII we allowed the German U-boats to sink our convoys rather > than let them figure out we had broken Enigma, they'll let the prosecution > fail rather than admit where the data came from. > > -- FD1D E574 6CAB 2FAF 2921 F22E B8B7 9D0D 99FF A73C http://pgp.mit.edu:11371/pks/lookup?search=tbiehn&op=index&fingerprint=on http://pastebin.com/f6fd606da _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
