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We all know that by using the Windows delete key and removing them from the trash is not going to be sufficient as I have previously written in one of my posts Recovering Deleted Files and Partitions.  SDelete is a tool that is capable of preventing these tools from recovering them!  Mark Russinovich tells us more about SDelete.

"The only way to ensure that deleted files, as well as files that you encrypt with EFS, are safe from recovery is to use a secure delete application. Secure delete applications overwrite a deleted file's on-disk data using techiques that are shown to make disk data unrecoverable, even using recovery technology that can read patterns in magnetic media that reveal weakly deleted files. SDelete (Secure Delete) is such an application. You can use SDelete both to securely delete existing files, as well as to securely erase any file data that exists in the unallocated portions of a disk (including files that you have already deleted or encrypted). SDelete implements the Department of Defense clearing and sanitizing standard DOD 5220.22-M, to give you confidence that once deleted with SDelete, your file data is gone forever."

Source: http://technet.microsoft.com/en-us/sysinternals/bb897443