Hi,
Computer Forensics sounds interesting, after reading the previous thread i am curious to know can data be retrived from broken CDs.............
c u
Aladdin
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Hi,
Computer Forensics sounds interesting, after reading the previous thread i am curious to know can data be retrived from broken CDs.............
c u
Aladdin
What thread are you referring to?
Well the data doesnt erase itself when a CD breaks, like if you break a small triangle foff of a side of a CD, the first 14 out of 17 songs may still play normal. But i dont know how you're gonna glue together a broken CD that it read all the data normaly since it would skip some part.
My guess is it wouldnt work if the cd were broken into pieces:D
Here's a bit of a link I was looking at though:
If you have problems with reading the CD, it's mirror surface could be contaminated by particles, fingerprints, various stains or, unfortunately, scratched.
To clean your CD use a soft lint-free cloth and apply light strokes in the radial direction only! The data on CDs are stored and read in a circumferential direction and the drive's optic is less sensitive to radial scratches you may generate yourself!
Data on CD disks is protected by a layer of lacquer on one side (mirror side) and by another layer of polycarbonate (PC) plastic on the other side (label side). The data are stored in the form of shallow pits in the PC matrix covered with a thin reflective layer of aluminum. If you scratch the disk and this scratch is deep enough to damage (remove) the pits, your data is lost locally. Fortunately, CDs are robust and not all scratches cause irreversible damage. If you have scratches on the mirror side of a CD and you really want to try recovering the data yourself (instead of looking for professional help), then, there are a couple of things you may try.
Complete article:http://www.usbyte.com/index_recovery.htm#CD
The theoretical answer to your question is "yes"
To completely destroy the data you would have to burn the CD , dissolve it or pulverise (reduce to powder) it.
If you just chop it into bits, they can be reassembled and read.
Hope that helps
And a little tip that i picked up along the way.
Well if you have a Cd and it's fairly scratched just apply a small amount of toothpaste on to your finger and then rub it onto the scratch.
Then before it dries up to much grab a tissue or some sort of soft like material and rub of the ToothPaste, it will patch up the scratch and you'll find that your Cd's that would once skip or not work properly should start working like knew.
1+1=2
Sort of related,
A friend of mine once gave me his copy of a utilties progam. This cd was like nothing i had ever seen befor, there were holes you could look through.
I took one look at it and said there is no way that will install........ It did though.
Draw your own conclusions from that.
aladdinhere,
The Law Enforcement Community, FBI, etc., have been piecing together tapes, floppies, HDDs, and most likely CDs as well, for a long time. For surface areas on CDs where data might be missing, they have been real successful at making assumptions on what the data was based on the remaining portions. Sorta like math.
Just food for thought.
cheers
MemorY,
Yes, it wouldn't play/read "normally" but this is a forensics question so I am assuming that the disk has been reassembled in a forensics lab and that the contents are being scanned for, rather than read. Electron tunnelling microscopy?Quote:
But i dont know how you're gonna glue together a broken CD that it read all the data normaly since it would skip some part.
Now, if you think about it, just chopping the disk will cause some damage where the cuts were made, but what percentage of the total data area will that damage represent? Given the right kind of software, it is highly probable that the data could be recovered, and the missing bits "reconstructed".
I guess it is a bit like one of those jigsaw puzzles................if it is around 60% complete with a random distribution you will almost certainly be able to work out what the picture is of?
1+1=2
Yes, that sounds pretty good, I remember a few years back there was this review in one of our PC mags of a product that recovered damaged CDs. It had a very fine carborundum grinding disk in it. The guy who tested it got a music CD and scratched up so it wouldn't play, put it in this machine, and the thing played perfectly! I think that the running costs were about $2.5 per CD.
After all, toothpaste is a very mild (fine) abrasive?
Jinxy, I can see no real problem with that...........there was nothing in the place where the holes were?...............a bit like a hard drive with damaged sectors, the system just skips them and goes to the next good one?
Cheers
EDIT: Damn! Relyt you beat me by two minutes :D
I have also found petroleum jelly to work in the same fashion. Works every time on music cds.Quote:
Originally posted here by 1+1=2
And a little tip that i picked up along the way.
Well if you have a Cd and it's fairly scratched just apply a small amount of toothpaste on to your finger and then rub it onto the scratch.
Then before it dries up to much grab a tissue or some sort of soft like material and rub of the ToothPaste, it will patch up the scratch and you'll find that your Cd's that would once skip or not work properly should start working like knew.
1+1=2
You are, as always quite correct. Nihil.Quote:
I can see no real problem with that...........there was nothing in the place where the holes were?...............a bit like a hard drive with damaged sectors, the system just skips them and goes to the next good one?
My piont or is it point,.... that looks much better(i have had a few classes or was it glasses of red wine) :D
The disk i am refering too looked like swiss cheese. I do understand what you say though.
I have come across disks that would not be read, unless they were ruffed up a bit ;) I would elaberate (dam the spell checker) but i would hate to be thought as as a would be cracker
Yet another method of restoring a music CD or a burner CD is to take a little bit of mano, spread it thin, let it sit for a minute and then rub clean. Don't do this to game CDs though. I killed a copy of Soul Reaver trying it..Quote:
Originally posted here by The Grunt
I have also found petroleum jelly to work in the same fashion. Works every time on music cds.
Hey Hey,
To me broken doesn't have to mean in pieces, a clock is broken when it does work but it can still be whole. It could be a scratch, damaged data, erased data, etc... I've found that an absoluately amazing product is BadCopy Pro. From their product description....
I've only had one disk that it wasn't able to help me with. It was a Maxell CD-RW and a number of years old. It was able to tell me that the CD contained a 384MB track, however it said there were no files in the track. I later used ISOBuster to rip myself an ISO and then learned that the track was filled with 0s. So it wasn't that bad copy pro failed, there was just nothing there to save.Quote:
Some situations where BadCopy Pro can help
Damaged floppy disk repair and floppy data recovery
Damaged or defective CD-ROM, CD-R, CD-RW data recovery
Recover inaccessible data on floppy disk or CD discs
Rescue lost files from floppy disk or CD-R, CD-RW
CD-R burning problems and data loss recovery
Corrupted, unopenable or unreadable files recovery
Retrieve data from all sessions on multi-session CDs
Lost photos recovery for storages used in digital cameras
Floppy disk deleted file or quick formatted disk recovery
UDF and packet-writing disc. Supports DirectCD and InCD.
Iomega ZIP disk, JAZ or MO Disk files and data recovery.
Risk-free: BadCopy is safe, no write action on your original disks, that finally saves the recovered data to a new folder you specify.
Peace,
HT
Holograms !!
CD's are gonna fade out in the coming few decades...Quote:
Holographic memory offers the possibility of storing 1 terabyte (TB) of data in a sugar-cube-sized crystal. A terabyte of data equals 1,000 gigabytes, 1 million megabytes or 1 trillion bytes. Data from more than 1,000 CDs could fit on a holographic memory system. Most computer hard drives only hold 10 to 40 GB of data, a small fraction of what a holographic memory system might hold...
Holograms are the next generation data storage devices..
Hologram stores the data in the form of pictures (For the physics part of it.. It stores both wavelenght and path diffence of the wave hece enabling 3D viewing.)
Its major advantages are its high data storage capabilites and that the entire data can be retrieved even by getting a very small piece of hologram, but only a very small reduction in image resolution.
Entire article here .Quote:
With such technologies on the market, you will be able to purchase the first holographic memory players by the time "Star Wars: Episode II" is released on home 3-D discs. This DVD-like disc would have a capacity 27 times greater than the 4.7-GB DVDs available today, and the playing device would have data rates 25 times faster than today's fastest DVD players