Any user on your network can plug in a USB stick the size of the average keychain and take in/out 1GB of data: Therefore users can take confidential data or they can introduce viruses, Trojans, illegal software and more! Regain control with GFI LANguard Portable Storage Control (P.S.C.)! GFI LANguard P.S.C. offers you network-wide control of which users can: Plug in a USB or other removable storage device Access CDs Access floppies. You can define which users can use removable media centrally from Active Directory - simply by making them a member of three pre-defined groups.