I'll try an audio CR-R and also a CD-RW. I've even bought a "production" CD-r (I assume) of the Buckingham Nicks album. It looks like a regular CD with orignial graphics on the cd and jewel case. All of them cause the PMDT to say "no disc" on the display. Its not even about whether they skip or not. Now realize that the PMDT is a DVD player as well, which might mean they use a different color laser or something like that.