I have two dvd drives on my computer. One that is read only and the other is a dvd/cd burner. I have never had any problems backing up my store bought dvd's but when I try to copy a burned dvd the computer starts to read the dvd, and about after 5 min I get a error. This happens when I use either dvd drive. Is there a program that I need to copy burned dvd's or is it my dvd drives?