Yes re the avatar.
But with regard to an image missing its tail - the image is usually displayable with some corruption, an image missing both its head and its tail (which is what we are talking here - single sector) is not going to display and frankly has b****r all chance of running.
Yes re the avatar.
But with regard to an image missing its tail - the image is usually displayable with some corruption, an image missing both its head and its tail (which is what we are talking here - single sector) is not going to display and frankly has b****r all chance of running.
But, if you've got the original file/picture to hand you can present a pretty good argument that the data used to be on that disk, even just a sectors worth (which is 1Kb on a CDROM after all). The chances of it being something else are slim.
Obviously only an utter idiot would build a case just on that but as supporting evidence it has validity.
No validity at all Hugh - if you have the picture on a computer then it is evidence and you dont need a tiny fragment from a CD.
No barrister I have worked with would want to run that past a jury.
Oh, and its 2K on a CD
Oh, and its 2K on a CD
Well, 0x800 does sound a lot like 2,048 and conversely 2K. 😉
jaclaz
No validity at all Hugh - if you have the picture on a computer then it is evidence and you dont need a tiny fragment from a CD.
No barrister I have worked with would want to run that past a jury.
Oh, and its 2K on a CD
So how do they float partial DNA matches past the jury ?
Your're missing the point, it's not about the picture. The OP asked about data, not a picture, a picture was used merely as an example.
I made the point that its not something to safely build a case on but could have some validity as supporting evidence.
For (another) example. OP's mate is suspected of being an urban terrorist. Police think he had a copy of the 'Dummies Guide to Urban Warfare' on his CDROM in compressed PDF format, the smoking gun that they need to put him away.
So they get a copy of this file (from a third party source), block hash it and compare those hashes against the 1kB, 2kB or 2,336 byte sector that they've (miraculously) pulled from the CDROM fragment. Hashes match.
Add that to the sweaty balaclava and a dislike of soap and away you go, case stronger for the CD evidence.
Your barrister doesn't sound like any fun at all.
Oh and it's written 2kB.
(Simon is angry)
Hugh the first quote I made was re a smoking gun - its not.
In your scenario I still doubt it would get to court - sweaty kit and a fragment of a book (that could arguably have been in a page from an online newspaper) - even more difficult to use if you can't put it in context amnd cant attribute something from the CD to the perp.
We are going around in circles here - there to my knowledge has never been any use made of anything like this - spare secrtors (from glists plists etc.) would be much easier to get and to my knowledge have never been used.
If the pros had better evidence they would use it (keep it simple), if they had to resort to a sector as in your scenario I very much doubt the CPS would bother.
Anyway old CD's were made from cabbage extract and degraded as soon as they were scratched )
I think hmorgan's summary is good.
The major problem is actually getting a sector. Sticking a CD together I have found impossible because the recording film is normally very damaged. Cut into multiple pieces is even more impossible, if you are trying to use any kind of reader. Hence in my mind, I assume only a microscope stands any chance. Any bit misread will of course invalidate any hash searching, unless the ECC can fix it.
I am not sure what the original question is asking
Is it - can data be found
OR
Is it safe to cut CDs up and be happy that data will not be found.
I cut my CDs once and am happy that no one will read anything - but I also don't have anything on my CDs that I consider 'top secret'.
I cut my CDs once and am happy that no one will read anything - but I also don't have anything on my CDs that I consider 'top secret'.
BUT, do you also send fragments to random addresses in China?
http//www.forensicfocus.com/Forums/viewtopic/t=9682/
jaclaz
I cut my CDs once and am happy that no one will read anything - but I also don't have anything on my CDs that I consider 'top secret'.
BUT, do you also send fragments to random addresses in China?
http//www.forensicfocus.com/Forums/viewtopic/t=9682/jaclaz
No, they go to an address near Florence
BUT, do you also send fragments to random addresses in China?
It turned out that the maximum CD fragment size which I'm allowed to send to China is 10 mm².