To actually delete the data, you would have to overwrite the section of the harddrive.
Think of your harddrive like a whiteboard. You can write all over it and then decide to get rid of something. Deleting it would be like crossing out the bit you don’t want. The data is still there.
But then you have another idea, and you write it over the bit where you crossed something out. You’ve now replaced the information.
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