How comes? It is because the files deleted in this way are overwritten by meaningless data. In the early version of OS X, if you want your sensitive information can be deleted permanently, you can use Secure Empty Trash, in which way the deleted data couldn’t recovered even with the recovery software. That is to say, the deleted data can be recovered with some data recovery tools. However, thought those files disappear on your Mac and the storage space that the files occupied is available for use, they don't actually erase from your computer. Part 1: What is the difference between Empty Trash and and Secure Empty Trash? When you come across the useless files that you don't want anymore, you would drag them to the Trash and then click on the “Empty” button on the top-right corner of the Trash window.
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