A method and system for securing a removable module. Upon removal of the removable module from a computer system, the removable module is locked. The removable module may be locked by setting the removable operating system module to auto lock, by pressing a lock button on the removable module, or by setting a time delay, where the time delay determines the time after which the removable module locks after removing the removable module from the computer system. Upon reinsertion of the removable module, a user attempting to use the removable module is first authenticated. The user may be authenticated by the user entering a password and the system comparing the password to a list of authenticated passwords, by scanning the user's fingerprints using a fingerprints scanner or the user's retina using a retina scanner and comparing the image to a list of authenticated image signatures.