Which army regulation would be referenced if you want to properly mark removable ais storage media?

To protect and mark classified and/or sensitive information stored on AIS media is contained in AR 380-19 Information Systems ecurity. Equipment will be protected as follows: (1) AIS that have nonremovable media upon which classified files reside must be stored in an area or container approved for safekeeping of classified information per AR 380-5. (2) AIS that do not have classified files on nonremovable media should be in a locked office or building during nonduty hours, or otherwise secured to prevent loss or damage. Users will log off the computer when they leave the area.