I have a drive that deep scan finds virtually 95% of my video files (4GB and larger). However, none of them restore. Not corrupt, just won't restore. No errors of other information.
If files larger than 4gb have been deleted - as opposed to a disk failure - then NTFS will overwrite all the file's cluster addresses. In that event the files aren't recoverable without professional help, and possibly not even then. It is theoretically possible for a deep scan file (with a [01234].ext name) to be in one contiguous 4gb+ extent, in which case that could be recovered, so it's worth a look.