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Which method of data erasure is used when only special laboratory techniques can recover the data?
Overwriting
Purging
Clearing
Destruction
Clearing is the removal of sensitive data from storage devices in such a way that there is assurance that the data may not be reconstructed using normal system functions or software file/data recovery utilities. The data may still be recoverable, but not without special laboratory techniques.
Clearing is typically an administrative protection against accidental disclosure within an organization. For example, before a hard drive is re-used within an organization, its contents may be cleared to prevent their accidental disclosure to the next user.
Reference: https://en.wikipedia.org/wiki/Data_remanence
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