Your Motorola Droid cell phone came packaged with a cable that connects to the phone on one side and to a USB port on the other. Connect the phone via this cord to your computer's USB port. The Plug and Play interface will acknowledge the connection. On the phone, you'll want to open your notification screen, at which you'll see a prompt offering to change the USB connection type. Select this prompt, choose "Mount as disk drive" on the next page, and you'll be able to treat your phone as another drive on your computer as long as it's connected.