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Making the data impossible to recover even by applying physical forensics methods is known as __________ of media.
Erasing
Deleting
Clearing
Purging
Clearing, or overwriting, is a process of preparing media for reuse and assuring that the cleared data cannot be recovered using traditional recovery tools. When media is cleared, unclassified data is written over all addressable locations on the media. One method writes a single character, or a specific bit pattern, over the entire media. A more thorough method writes a single character over the entire media, writes the character’s complement over the entire media, and finishes by writing random bits over the entire media. It repeats this in three separate passes, as shown in Figure 5.2. Although this sounds like the original data is lost forever, it is sometimes possible to retrieve some of the original data using sophisticated laboratory or forensics techniques.
Source: Certified Information Systems Security Professional Study Guide Seventh Edition, Chapter 5 - Protecting Security of Assets
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