My friend has a Panasonic CX-DV1500 mobile DVD player in his car. We're trying to find some media that will work in it. So far we've tried:

TDK 2X DVD-R
Imation DVD+R
Fuji DVD+RW

All give an 'invalid media' error. I hate to just keep trying randomly. Has anyone had any luck with DVD±R(W) discs with this player?

Thanks,
Alex