Why does deleted data stay on a HDD once written, waiting to be overwritten, as opposed to being removed when requesting deletion?
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Imagine you got one of those [bubble fidget toys](https://m.media-amazon.com/images/I/51yk1esQdgS._AC_SY580_.jpg) and you pop in a smiley face pattern on it. That’s kinda like having a HDD with memory saved on it in that it’s got spaces that are in one of two states, 1 or 0, or popped in or out in the case of the fidget toy.
You’re done making your smiley face so you hand it to your sibling, who wants to make a frowny face. Now they *could* first unpop all the spaces first then proceed to fill in spots to make a frony face, or they could just pop/unpop the spaces needed to make their frowny face. Since unpopping them all first takes extra time and doesn’t really help make the frowny face, it’s strictly a waste of time.
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