The only trouble is that if he has the kind of media files (e.g. mp4, mkv, wmv, and normal ones that have very low quality) since don't really benefit that well from compression because they already have some sort of compression.
that's what I was gonna say. compression works fantastically for documents and most images but not as well for audio or video since so many commonly-used file formats are already just about as efficiently compressed as possible.
