Re: Interesting One

From: John Orr (JOrr@austinbank.com)
Date: 10/29/02


Date: Tue, 29 Oct 2002 12:15:22 -0600
From: "John Orr" <JOrr@austinbank.com>
To: <dadams@johncrowley.co.uk>, <security-basics@security-focus.com>


  Personally, I think he is full of... hot air.

  Bits are either "on" or "off", "1" or "0". If you change that pattern (i.e. write over the same data area with a different sequence of bits), then the previous state of that field would not be determinable. Granted, there may be some residual magnetic field left on a particular area that is now "0" that had been "1", but the converse would not be true. There would be no residual field to read on an area that is now "1" that had been "0".

  Sounds like sales fluff to me.

  Anyway, that is my opinion, based on years of experience and a good knowledge of physics.

-John

--------------------------------------
John Orr
VP/CIO
Austin Bank
903.759.3828 x2113
903.297.3094 fax
jorr@austinbank.com

>>> "Dave Adams" <dadams@johncrowley.co.uk> 10/28/02 04:06PM >>>
Greetings Folks,

I had an interesting conversation today with someone from FAST
(Federation
Against Software Theft) They pretend not to be a snitch wing of the BSA.
Anyway, to get to the point, the guy that came to see me said that their
forensics guys could read data off a hard drive that had been written
over
up to thirty times. I find this very hard to believe and told him I
thought
he was mistaken but the guy was adamant that it could be done. My
question
is, does anyone have any views on this, or, can anyone point me to a
source
of information where I can get the facts on exactly how much data can be
retrieved off a hard drive and under what conditions etc etc.

Thanks

Dave Adams
 
 
 
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