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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When you delete a file, you are not really removing it. You are removing the directory that points to the file. So the information is there, but the phone has that storage space marked as available, so a new file can be written on the space where the old one is.
(That is why deleted files can sometimes be recovered)
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