CD-R/DVD-R read failure on Mac Mini

[AdmiralAK]

Here's an interesting problem.

I've got *some* DVD and CD backups that I've made on a PowerBook G4 and an iBook G4. They work fine on the laptops, however when I pop the discs into my intel mac mini the disc comes up as blank and I am prompted to tell the computer what I want to do with it. The discs are not blank.

Other discs (commercial and DVD/CD backup discs) work fine on the mini.

Any ideas as to what may be causing this? (Discs are CD-R and DVD-R, not RWs or +R)

[djackmac]

Try burning from the mini and then see if it reads what it had burned.

[AdmiralAK]

The stuff burned on the mini are legible discs :-)

[djackmac]

I'd try a different media (i.e. flashdrive) to backup the stuff and see if the mini sees it ok. Otherwise I'd suspect a flaky optical drive as I've seen issues like that before.