Do not trust Windows delete operation. It does not erase your data from your hard disk at all. Other people can still recover your deleted files and access the data you don't want to be revealed. For example, people can restore your deleted files with Stone File Undelete. If you want to protect your data from being restored, please try Stone File Eraser. It will remove sensitive data from your hard drive completely and keep your data safe.
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Windows Server 2008,