Files can be recovered after Wipe Free Space in CCleaner Help Requests Posted Sunday at 13:04 Drive Wiper runs a wipe MFT before a WFS, in as much as it overwrites the file names and data in the MFT. The total number of deleted files in the MFT remains the same, but the file names and data have gone. WFS in Options has no affect on Drive Wiper settings, and Secure Erase has no effect on WFS at all. So stick to Drive Wiper. I don't know what Disk Drill is returning (and I don't really want to know). I know that once CC Drive Wiper has overwritten the free space (and it does a preety good job at that) then that overwritten data can't be recovered by any means. Maybe DD is returning deleted file names (which should be ZZ.ZZ after running Drive Wiper) or maybe it is returning live files, but it cannot, under any circumstances, return any data that was there before being overwritten.