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I've an old music CD and it's all scratched, is there anyway that i could check if there is any unreadable part on it?
Something like fsck for CDs/DVDs?

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A passed read check doesn't tell you if the data you got is valid or corrupted (e.g., you can have an audio CD that reads fine but yet shows noise/artifacts). –  htorque May 15 '11 at 10:55

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There are some tools you can use to recover data on the CD (well, not all data, anyway).

The tools I think of are ddrescue (or GNU gddrescue):

ddrescue - copy data from one file or block device to another
gddrescue - the GNU data recovery tool

and dares:

dares - rescue files from damaged CDs and DVDs (ncurses-interface)
dares-qt - rescue files from damaged CDs and DVDs (Qt-interface)
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Take a look at Rubyripper. Do a rip of the CD in question. When that's complete you'll get a .log file which will report on how the rip went.

From the Hydrogenaudio FAQ, Correction mechanism section:

it will repair any files so that it's impossible to successfully blind-test with the original via an ABX test for example. The log file will optionally report any position that needed more than 3 trials, so you can check the position yourself.

That's the best I can think of.

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