[wazoo2u]

Audio CDR's and Computer CDR's are identical, except the Audio CDR's have a flag embedded in them which tells "standalone" CDR Recorders that the media has had a license fee paid.

If you can see the data files in Explorer, but can't transfer or open them, then your problem isn't the TYPE of media, but some other incompatibility or corruption.

There are some programs (CD Roller comes to mind) that will recover data from "unreadable" discs, but it might just be easier to send the trader some media from your own stock that you know will work in your CD reader. If THOSE come back bad, I'd find someone else to trade with.