Once you delete a file, it’s very possible and probable the selected file could be damaged by another file. But more likely, the damage could stem from the file being overwritten by another file. The deleted file could also get damaged by disk defragmentation, an attack by malicious software like virus or malware or even the adverse activities of hackers (Microsoft Office files, in particular, are very vulnerable here).
There are large files which are often saved in distinct, separate locations on your drive because they cannot share the same, immediate hard disk space with each other. Recovery of such files is pretty much impossible-or difficult, at best-because even though the file’s initial location can be pinpointed, the information on where the other fragments are located is often erased for good.