I bought a 15 pack of dual layer dvds and already killed 3 of them. I tried burning the dmg (from windows) to it and it would always stop around 70% no matter what program I used. The flash drive I created from the same dmg works though, because it would boot on my iMac. I can't burn a dvd on my iMac though because my slot loading drive is broke and wont eject correctly without using something to guide the cd out.