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Old 10-12-2005, 01:44 PM   #1
Registered: Dec 2003
Distribution: RedHat 8.0, 7.1 and Enterprise WS 3,4
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Copy from DVD - Input/Output error


About 2 months ago I burned some data on a linux machine running Redhat to a DVD. Now I'm trying to get some of the data off. On the disc there are 7 folders, all containing the same type of data (although not duplicates of each other). With all of the folders but one I can copy the data off the DVD without a problem. However, with one of the folders I can't copy any of the files, instead I get the following error:

cp: reading '<file>' : Input/output error

I've also tried copying the files on a PC running Windows XP and again I can copy every folder except one, and when I try and copy a file from that folder I get the following error:

Cannot copy <file>: Data error (cyclic redundancy check).

Does anyone know what these errors mean and why I'm getting them? Also, is there a way I can get at the data on the DVD (it appears to the correct size on the DVD)? Thanks very much.

Old 10-12-2005, 02:09 PM   #2
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It means that there are more errors than the error correction algorithms can correct for. On a DVD, this is usually caused by scratches (even tiny ones, if they follow the track), or excessive fingerprints/smudges/hair/dust on the surface.

You can try gently cleaning the disk with a liquid soap and cool water. Dry with a soft cloth (wiping from the center toward the outer rim, NOT around the disk). Handle the disk only by the edges.

If that doesn't work, you can try a mechanical cleaner/scratch remover. They re-buff the surface, but they can cause more problems then they solve. Use as a last resort.
Old 10-12-2005, 02:32 PM   #3
Registered: Dec 2003
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Thank you, I'll give it a shot.



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