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Locked disc

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I have been running Retrospect 5.1 for several years on my G4 Mac without major problems, but lately I get an "Incompatible (unknown CD/DVD)" message when I insert a disk for backup. If I select "Proceed" the message "The disc is write protected. Please unlock it and try again" appears.

I have tried different mfr. disks new and used but nothing works. Am I missing something - is there a simple way to unlock a disc?




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