I have last revision imac.. g5 2.0ghz superdrive 20 inch.. Im an idiot lol and i cant remember if the burner is dual layer.. If so..Can i buy dual layer media, and will i be able to burn onto it with my other computers, that are only single layer? Also, how can i copy dvds using the dual layer.. Is there any one click solution like there is on windows, (dvd x copy)