I am having problems with my NEC ND-3520A. I plugged the burner into my computer but it doesn't read it as a dvd-rw drive. When I insert my Sony DVD-R+ media into the drive it does not read it at all. It can read cds but not dvds. I set the burner to master and my Lite-On LTR-52246S as the slave drive. Any advice would be much appreciated.