I heard you can use your USB flash drives like your memory sticks in your laptop or desktops. Is this true, and is this a good idea? If this is a good idea, what are the steps for setting it up that way? Also, I heard that you can install operating systems on them. Is this also a good idea, how big of a flash drive would you use, and how would set it up? If you were able to do it would it be safe to do it?