The spec for this machine says that it will only play
DVD-ROM, DVD-R, DVD-RW. The fact that it plays certain types is one of the strange idiosyncrasies of these equipments. Find the ones that do work and stick with them. One of the reasons that some disks may play on 1 system and not another is that the original recording may not have been fianlized, which leaves it only playable on the system that it was recorded on.