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Your Droid X2 is not an island—it’s built to work with your computer as well. So if you’ve got a music collection on your PC, for example, you can sync that collection to your Droid X2 and listen to music there. You can also transfer pictures and videos between your Droid X2 and PC or Mac. In fact, you can transfer any file between your Droid X2 and your computer.
Specifically, when you transfer and sync files between your Droid X2 and your computer, they go on the phone’s SD card. The Droid X2’s main memory is used for storing system files and applications, rather than music, videos, and pictures.