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Data clearing
Provides assurance that the media or device hosting the data is unusable.
Provides assurance that data is unavailable via laboratory attack.
Provides assurance that data is unrecoverable even by forensic tools
Provides assurance that data is unavailable via system utilities (including file recovery applications).
CISSP Cert Guide p355: Data Clearing: renders information unrecoverable by keyboard. (e.g. Software utilities) Data Purging: Using a method such as degaussing to make old data unrecoverable even with forensics
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