Hello Matthew, Some advertisements in the (German) magazine C'T number 8/2001 : Datenrettung im Labor by Ontrack Data Recovery GmbH, 24/7 service, see www.ontrack.de Professionelle DatenRettung by Ibas Deutschland GmbH, see www.datenrettung.de Their services are however not really cheap. BTW if I am not mistaken C'T has also published an article on this stuff. Yes, a quick search shows me : 3. Christian Rabanus: (chr) Die Profis Datenrettung in Speziallabors Report, Datenrettung in Speziallabors, Ontrack, Ibas, Convar, Vogon, Headcrash c't 6/00, Seite 130 (That is thus number 6 in the year 2000). Enjoy, Fred "Brown, Matthew" wrote: > > It might be possible to examine recently overwritten data at > the bit level. This would involve removing the platters from the hard > drive case in a level-10 clean room and remounting them on a highly > expensive, highly sensitive electromagnetic field reader. This reader > would have to have the ability to pin-point and measure each bit > recorded on a platter (not a small task) and record it's > electromagnetic readings for each bit in a separate storage area. By > evaluating the readings of the bits you could then determine which > bits had been recently changed. The idea would then to determine > which bits needed to be toggled back to their other state. In theory, > or so I've been told, this would render the data as it was before it > was overwritten. > > Two things: > > 1. I was unable to find any commercial services that advertise or > perform this procedure. I did find references to several technologies > that would lend themselves to being able to read or evaluate the > values of a bit, but none were specifically designed to perform this > procedure. I was in the Air Force in the early 1980s when I first > heard about this, but was surprised to little information on this > theory (at least the usenix had some papers on the subject, theory > that is). > > I hope someone else has heard of this theory/procedure and can > shed some more light on the matter. Other feedback is welcome. > > Matthew Brown, CISSP > California -- Fred Mobach - fredat_private - postmasterat_private Systemhouse Mobach bv - The Netherlands - since 1976 The Free Transaction Processing Monitor project : http://www.ftpm.org/
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