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Universal Serial Bus (USB): An external device that transmits data from one part of a computer (e.g., the keyboard or the mouse) to another (e.g., the computer hardrive). A USB drive is a small, external hard drive that plugs into a computer and allows the user to download information and manually transfer it to another computer.

glossary from http://electronic-medical-record.blogspot.com/2007/06/common-emr-medical-software-terms.html