What Actually Happens to All Your Deleted Files?

We delete files all the time to free up space, or to get rid of pesky evidence, but the whole process is a lot more complicated than it seems from the outside. When you go to "delete" something, you're just pressing the start button on a much more involved, much more random process. So what actually happens to that… » 7/20/13 1:00pm 7/20/13 1:00pm