I have a set of 24 dvd’s (educational software pkg) that I need to make backup copies. All of these are originals and none had security coding. All of the remaining 23 dvd’s copied just fine with Nero. The last dvd will not copy - in fact - will not even play. I put the dvd into my NEC ND-6500A DVD+/-RW and it is not recognized at all - the player just keeps whirling. I have already tried cleaning the cd with ethanol and do not see any significant scratches or disregularities. I have tried this dvd on a stand-alone dvd player and it loaded and played just fine. I also tried it on a Mac today - again, it loaded just fine. For some reason, it will not play on my pc, and I don’t see how I can copy it if I can’t even get it to play.
Any help would be greatly appreciated.