Is it a CR-R or a CD-RW? Once data has been put on to a CD-R it can't be erased. If its a CD-RW then that's a different matter I can point you in the direction of some recovery software but did you re-format the disk? If not how did it get erased?
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.