One more vote for trying different drives.
I've been talking to a co-worker about how frail burned CDs are. He managed to retrieve data from a poor, old CD by trying several computers.
I'm not sure which was most successful, an older drive or a newer one. I'll have to ask.
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10101311 (20GB- backup empeg)
10101466 (2x60GB, Eutronix/GreenLights Blue) (Stolen!)