Just a quick guide in how to configure an External Drive ie External Harddrive(HDD) or Flash Drive .
1.Make sure you plug your device into a spare usb port on the console.
2.Go to the dashboard on your xbox and scroll all the way to the right until you get to settings.
3.Go into Memory and find the drive inserted.
4.You may be prompted to format the drive ( You must do this in order for the xbox to read it).
5. Once the format is done you may now plug it back into your computer and fill it with music and movies even game saves.
6. You may be prompted to download an update in order for the console to play the videos.
If you have an questions please reply in this post