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Your Droid X 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 X and listen to music there. You can also transfer pictures and videos between your Droid X and PC or Mac. In fact, you can transfer any file between your Droid X and your computer.
Specifically, when you transfer and sync files between your Droid X and your computer, they go on the phone’s SD card. The Droid X’s main memory is used for storing system files and applications, rather than music, videos, and pictures.