Choosing Secure Empty Trash causes files to be over-written. The Secure Empty Trash command does just this. Instead, the way to delete a file is to over-write it. As you can see, files are never really deleted. This effectively destroys the original file. This storage process over-writes the original file. Some day, maybe many months later, the computer will store a new file in that same location. The removal of this record indicates that the file’s storage location is available for re-use. Instead, the only thing that happens is the removal of a record indicating that the file exists in some assigned location. Typically, when you select Empty Trash the file is not destroyed.
If you really want to destroy that file, you should use Secure Empty Trash, which will overwrite the file. To do this, put a file into Trash, then click on the Finder menu and select Secure Empty Trash. When you put a file into Trash and then empty the Trash, you aren’t really deleting or destroying that file.
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