A procedure used to erase or overwrite classified or unclassified-sensitive information stored on magnetic medium. Clearing allows reuse of the medium at the same classification level, but does not produce declassified medium.
Removal of data from a computer, its storage devices, and other peripheral devices with storage capacity in such a way that the data may not be reconstructed using common system capabilities (that is, keyboard strokes); however, the data may be reconstructed using laboratory methods. Contrast with "sanitization". Guidance Note: Clearing of classified information from media does not permit the reuse of that media at a lower classification level or in an unclassified mode.
Removal of data from an AIS, its storage devices, and other peripheral devices with storage capacity, in such a way that the data may not be reconstructed using normal system capabilities (that is, through the keyboard). An AIS need not be disconnected from any external network before clearing takes place. Clearing enables a product to be reused within, but not outside of, a secure facility. It does not produce a declassified product by itself, but may be the first step in the declassification process. See purge.