Securely Deleting Files
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Many users believe that when something is deleted from the computer it is gone for good. However, deleting a file or folder simply tags that the space previously occupied by that file or folder can be overwritten. To be more secure, you need to delete the file or folder and then immediately overwrite that space with something else. In Mac OS X you can use the Secure Empty Trash function. Instead of right-clicking on the Trash just emptying the trash, in the Finder go to the “Finder” menu > “Secure Empty Trash”. There is no in-built way to do this in Windows, but a good free utility to accomplish the same is Eraser (eraser.heidi.ie).
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