Of course hard drive space is real. Each data bit occupies physical space consisting of magnetic domains. For more data either you need greater physical size or use fewer domains per bit. Of course space meaning an area within a field.
Then how can you delete a bunch of stuff once the hard drive is full, then add more, but yet a forensic team can recover what was deleted?
Like erasing pages of data on a piece of paper written in pencil, then penciling over it with new data. Even after erased, careful inspection can reveal what was erased and written over.
