first off, the ngc will only read a small limited number of types of dvds, period. and even those that it does read, chances are, it will require you to adjust the POT level in order for the certain disc to be read. as said, ritek g04 mini-dvds work, as do g05 in the normal sized disc department, and the POT would have to be between 90 and 120ohm if my memory serves me correctly