Where do deleted files go from mobiles or computer systems?

First of all they don't go anywhere they remain in the mobile phones and computers.When we delete a file, it is unreadable by the mobiles and computer.However the file is still on its memory or at some particular location,at least until other file is saved to the same location.

Further more on any hard disk there is a table stored that shows some certain file is stored at the particular location (s).When the file is deleted, the original character of the file is removed and it is marked as "unknown".Now from the next time drive knows that the location which is marked as unknown were free to be overwritten with new data.
As long as no fresh data had been written over that certain location with information, everything was still there and that's why we could recover it by data recovery software and apps.



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