Why does deleted data stay on a HDD once written, waiting to be overwritten, as opposed to being removed when requesting deletion?

Question

Why does deleted data stay on a HDD once written, waiting to be overwritten, as opposed to being removed when requesting deletion?

In: 22

Answer 1

Fully deleting a file is just writing a “blank” file over it.

Its just so much quicker to forget the file exists. So that most of the action from a drive is writing actual useful data and not useless blank data.