I think this is what you need

Hello. ive had dvd's that will not read in my drive also, i still havent figured it out yet either. Im using a sony 820a burner, but also have a sony dvd drive, it wont read in either drive, must be the disk??? But then again when i try to rip some dvd's to my hdd they wont rip??? Even some older movies like bring it on even have some burnt movies from a friend that i cant rip, any suggestions?