I currently have a Dell 8200, 40 GB. 1.4 GHz; Sony DRX-510UL External Burner; and Sony DVP-NS715P DVD Player. I used DVD XCopy to backup a dvd, using Memorex +R. The burn was successful. However, my dvd player will not recognize the dvdr. I am able to watch the movie in my dvd burner though. I have read threads where others have played these dvdrs on this player. Any thoughts?