I don 't understand this...I have had nearly 99% of ALL my -r discs work in drives. Far far less percent +r. In fact, I stopped using +r. Why are there no -r drives. I don't want a dual format drive, I have found no use for +r, the compatability was/is horrible. Having a client come back and say that the DVD did not work is unprofessional at best! Am I missing something here? I just want to buy a -r drive.