Say if the internal storage of your phone were to fill up and you deleted something like a video or game, what is it actually doing to the file in order to take it off the storage and how are new files able to just replace it?
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Digital storage is similar to locker room with a manager.
When you save a file, the manager will dissemble your file. He will select some free lockers, take the old things out and put your things in, and mark those lockers. When you delete a file, the manager will remove the mark from those lockers so they can be used again.
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