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Residual Magnetic Energy

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(@wotsits)
Posts: 253
Reputable Member
Topic starter
 

Can anyone point me towards some reliable source material on residual magnetic energy?

All I've been able to find is a few random forum posts from people claiming anything from 'it's a complete myth' to 'I tested it in my lab today…'

 
Posted : 01/02/2016 7:50 am
Omnius
(@omnius)
Posts: 39
Eminent Member
 

Sounds like magnetic force microscopy. The papers below might be of interest.

http//www.vidarholen.net/~vidar/overwriting_hard_drive_data.pdf

http//cdn.intechopen.com/pdfs/33446.pdf

 
Posted : 01/02/2016 2:18 pm
jaclaz
(@jaclaz)
Posts: 5133
Illustrious Member
 

Just in case I will post here again (and "randomly") repeating how "it is a complete myth" to all practical purposes.

jaclaz

 
Posted : 01/02/2016 4:00 pm
aeiforensics
(@aeiforensics)
Posts: 27
Eminent Member
 

Sounds like magnetic force microscopy…

Here's a quote out of the 1st paper that sums it up well…

Resultantly, if there is less than a 1% chance of determining each character to be recovered correctly, the chance of a complete 5-character word being recovered drops exponentially to 8.463E-11 (or less on a used drive and who uses a new raw drive format). This results in a probability of less than 1 chance in 10Exp50 of recovering any useful data. So close to zero for all intents and definitely not within the realm of use for forensic presentation to a court.

 
Posted : 01/02/2016 7:49 pm
(@wotsits)
Posts: 253
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Topic starter
 

Thanks for posting that, a very informative read.

Perhaps a more accurate summary would be that it MAY apply to data storage devices as they were commonly in circulation around 10-20 years ago, however nothing currently on the market would produce any results.

 
Posted : 02/02/2016 3:34 am
(@trewmte)
Posts: 1877
Noble Member
 

Thanks for posting that, a very informative read.

Perhaps a more accurate summary would be that it MAY apply to data storage devices as they were commonly in circulation around 10-20 years ago, however nothing currently on the market would produce any results.

Has there been any cases or suggested probability of data being recovered following the treatment of degaussing (by handheld wand or machine)?

 
Posted : 02/02/2016 7:40 am
PaulSanderson
(@paulsanderson)
Posts: 651
Honorable Member
 

Thanks for posting that, a very informative read.

Perhaps a more accurate summary would be that it MAY apply to data storage devices as they were commonly in circulation around 10-20 years ago, however nothing currently on the market would produce any results.

I wouldn't say MAY, as we definitely did it about 20 years ago. been discussed on here a few times.

 
Posted : 02/02/2016 2:52 pm
(@mscotgrove)
Posts: 938
Prominent Member
 

[quote="PaulSanderson
I wouldn't say MAY, as we definitely did it about 20 years ago. been discussed on here a few times.

I thought 20 years ago the method was generally reading slightly off track. I am sure you got some results back, but how much of a disk could you actually get 100% correct?

20 years ago, I presume approx. 1GB drives.

 
Posted : 02/02/2016 4:00 pm
PaulSanderson
(@paulsanderson)
Posts: 651
Honorable Member
 

Sorry - a bit manic here hence the short reply (and didn't read links in posts above).

yes we read the sides of the track - which to my mind is still residual data )

TBH I can't remember success rates - it was good, i.e. very significant, but not brilliant.

 
Posted : 02/02/2016 4:06 pm
jaclaz
(@jaclaz)
Posts: 5133
Illustrious Member
 

Only for the record, this is what we have of the 20 years old success
http//www.forensicfocus.com/Forums/viewtopic/p=6559417/highlight=perpendicular/#6559417
(including a link to a nice animation of perpendicular recording way of working).

And here a link to a previous discussion about degaussing and perpendicular recording
http//www.forensicfocus.com/Forums/viewtopic/t=10123/

jaclaz

 
Posted : 02/02/2016 5:43 pm
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