I just bought a 25 pack bundle of TDK DVD-R 1-16X 4.7 GB. They all automatically eject when I insert them into my 1 Gz Ti Pb with 1X Superdrive. I never had a problem with TDK media in the past, in fact it is the brand I buy most often. My friend just gave me 3 Sony DVD-Rs and they work fine. Weird?