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CD-R is not durable
I also heard a lot about this problem. As for me, I copied a CD 2 years ago, but last month, I could open it and everything keeps no change.
Since I am in China, and they were some factories producing CD-R before, but now they changed to manufacture DVD-R. As I learnt from them, with different production technique, they could make different kinds of CD-R, grade A, grade B, or even grade C. But none of them could last forever...So take care of your important data.
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