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Deleting a file by dragging it to the Trash (Mac OS) or Recycle
Bin or typing 'del' at the command prompt (Windows) does not actually
remove the contents of the file from your hard drive. Your operating
systems simply flags it to be overwritten in the future. If there
is little disk acscess, the contents of these files can remain,
unchanged, on your hard drives for extremely long times and available
to anyone with a low-level disk utility.
But when you drag your top-secret document to the Kremlin Secure
Delete (Recycle Bin), it's just not flagged to be overwritten, it's
gone forever. Kremlin overwrites your documents with a variation
of the Department of Defense standard, writing zeros, ones, and
a pseudo-random bit stream and its binary complement a user-specified
number of times.
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