Which technique is NOT a media sanitization method?

Formatting is not considered a media sanitization method because it simply prepares a storage device for reuse by creating a new file system and marking the space as available. While it might remove the user-accessible data and make it less visible, it does not completely eliminate the possibility of data recovery. Data that is formatted can still be potentially recovered using specialized tools and techniques.

In contrast, the other methods—clearing, purging, and destroying—are all recognized forms of media sanitization that either remove or render the data unrecoverable. Clearing refers to overwriting the existing data with new data patterns, purging involves more thorough sanitization techniques that may include encryption or data removal exceeding the capability of standard data recovery methods, and destroying refers to physically destroying the media itself to preclude any chance of data recovery. Thus, formatting does not meet the criteria necessary to be classified as a proper media sanitization method.