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Security
This method, implemented by the US military, varies depending on the security
classification of the data to be erased. Should the data be classified confidential,
three random passes are required. This results in a quick erasure that is
suitably secure for data that is unlikely to have attempted recovery.
Secret and top secret data should be physically destroyed or degauzed.
Time
Going by the software method for confidential data, this method is quicker
than others detailed on this website.
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