So if Windows does not actually erase the file, what DOES it do when deleting? In fact, it does one simple thing: marking the record in the file system that points to that file as… deleted. (Note that this no longer applies to SSD drives more on that later). In other words, wiping the content of every file deleted would slow down your computer enormously. If Windows would be wiping all files it deletes, it would take a lot of time to delete that big movie. Note how the time required to delete either file is exactly the same. Try deleting a large file you no longer need, such as a big movie you have already watched. Indeed, this would take a lot of time if done that way. When a file is deleted (either by you via Windows Explorer, by another application or by the operating system itself), Windows will not immediately fill its content with zeroes or otherwise destroy the file’s content. With the many data recovery products offering to undelete your deleted files in a matter of minutes, have you ever wondered just how exactly it works, and why it’s at all possible? In this article, we’ll have a look at what Windows does when deleting a file, and what those tools do to reverse it.
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