I have an SSD installed partitioned into C & D......My PC tells me that there are about 250 MB of files that somehow have migrated to D but nothing I do will reveal what they are....Recuva tells that there are 10,000 files there, which it chooses to "ignore"....Having decided to wipe partition D, Ccleaner won't allow SSD's to be wiped.....(Yes, I know why).... but there should be an override function which allows a "once only" clean to be employed.
The ignored files are live files, those excluded by options settings (zero byte files, system files, etc), and anything excluded by specifying a path. I do not understand what '250 MB of files that somehow have migrated to D but nothing I do will reveal what they are....' really means.