I have heard about analogous situation. I don't know what's exactly reason. Propably some of data could be damaged or be shown as 0 byte size. I would recommend to give that drive to specialist who will recovery disk (If it is possible), because it could be problem with rewriting mtf. Try not to do on your own!* *If you want to do it on your own You should make safety disk image (copy whole disk with mbr and mft sectors ).