Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Data remanence is the residual representation of data that have been in some way nominally erased or removed. This residue may be due to data being left intact by a nominal delete operation, or through physical properties of the storage medium. Data remanence may make inadvertent disclosure of sensitive information possible, should the storage media be released into an uncontrolled environment. Over time, various techniques have been developed to counter data remanence. Depending on the effectiveness and intent, they are often classified as either clearing or purging/sanitizing. Specific methods include overwriting, degaussing, encryption, and physical destruction.

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