@jcolley: my edited dvd's are burned in a DVD-RW from TDK and they've behaved nicely so far. I've also done a copy of a friend dvd in some Moore DVD-R, and he complained (his wife in fact) that the navi stoped reading it after a while, but I never understood if it was related to the media or just because it's an older E46 3-Series (ours is a X3 2006). Never used any +R.

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My BMW: Photos