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Even a feature as basic as the disk mode, though, adds complexity, Microsoft said. For example, users sometimes get confused between songs that can be played versus those that are transferred to a player only as a file in disk mode. By making the Zune software the only way to move items onto a Zune, Microsoft hopes to eliminate any confusion. And although Microsoft is starting with a small feature list, Erickson said the company will be able to make additions fairly quickly through software updates. First on that list is compatibility with Windows Vista.