My guess is that he is referring to the 6-disc DVD changer (that used to be a 6 disc CD changer) that is in the glovebox, that I believe is only connected to the i-drive screen and not the rear console screen, though I can't say for certain since I don't have an E70. I thought/think the factory DVD player that is under the rear center console screen is only a single player and not a changer, though again I could be wrong...it's happened once or twice in my lifetime.