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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Computers do two main things on storage: read and write. Both these things can only be done so fast. Bigger files require more reading and writing than small ones.
The reason the actual file isn’t removed is because that requires writing over all the data which means it would take a long time for big files. So whenever something gets deleted, instead of actually removing the data, the computer just pretends it doesn’t exist.
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