Edit:
Fantastic answers, thanks all for the insight!
In: Technology
They are not really deleted but more like marked as “okay to overwrite” – so when you delete all your stuff and your computer looks like brand new with nothing installed, you can recover the files because there was nothing to overwrite them. But if you delete everything and fill your computer with a lot of everything new, it will overwrite the old places with new information. Just like you had a notebook and were writing in pencil. When you erase everything you have written in your notebook, you will probably still have some traces visible and be able to write the exact thing again just going on these traces. But erase and write something over it again, and it will be unreadable.
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