Typing cipher /?, at a command prompt, displays all the available switches.This tool bundled with XP provides the ability to permanently overwrite (or "wipe") all of the deleted data on a hard disk. This improves security by ensuring that even if an attacker gains complete physical control of a Windows XP computer, they would be unable to recover previously-deleted data.
Using this tool : Data that is not allocated to files or folders will be overwritten. This permanently removes the data. This can take a long time if you are overwriting a large amount of space.
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