That can/will happen if a Wipe Free Space is inturrupted unexpectedly, such as by a power failure or unplugging an external drive while it is wiping. Drive wipes work by filling up the disc (or the 'free' parts of the disc) with one or more files containing random data, (typically X's and Zeros) and then deleting that data. That way any files that you have previously deleted get overwritten with random data, and so cannot later be recovered by recovery software. Of course if anything