What must be marked on a storage device when it contains classified information?

When a storage device contains classified information, it is essential for it to be marked with a classification authority block. This marking serves as an official identifier of the classification level assigned to the information it holds. The classification authority block ensures that anyone handling the storage device can quickly ascertain the level of sensitivity of the information, who authorized its classification, and any specific handling instructions that may be required.

Including this block provides transparency and safeguards national security by ensuring that all users are aware of the information's classified status and their responsibilities concerning its protection. Proper marking is crucial for compliance with security protocols and for the prevention of unauthorized access or dissemination of classified documents. This marking system plays a significant role in maintaining an effective classification regime.