How to delete files so that they can not be recovered

Once you delete a file in Windows operating system, the index of the file is removed so that you will not be able to access the file contents. But if you use the recovery tools the files can be recovered if file is not overwritten by other files. 

Sysinternals has released a tool named SDelete with which you can use to overwrite the contents of the files that you have deleted. In turn SDelete overwrite the contents of free space on your disk drive. You can download SDelete from Sysinternal.  

SDelete is command line utility. You can use SDelete to remove deleted file contents from C drive using following command: 
    SDelete -z C


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