I have a stand alone dvd recorder combo unit. It uses dvd MINUS discs only. Both R/RW. It allows me to finalize or not finalize. If I finalize my dvd players will detecr it. My computer will not whether it is finalized or not. I opened my device manager and both the CD and DVD are listed, but the dvd does NOT say what format it is, region, or any other useful info. Can you tell me why this is? I made a tape copy to dvd for a friend but as I told her I have no idea if it is playable on her TV combo or her laptop. Is it possible that the computer drive plays PLUS dvds but NOT MINUS DVDs? Is it possible that my secondary computer plays BOTH PLUS and MINUS? As I said this info is not displayed. Of course I do not have any printed documentation. Solutions? replace drive? With what? I would like both towers to play these dvds.