I've found a bug in CCleaner 3.21.1767's Drive Wiper. This bug didn't exist in the prior CCleaner version. Let me explain I have a OCZ Vertex 3 120 GB Max IOPS ssd (Windows 7 x64 Professional SP1& Programs) and 2 W.D. Cavair Black 1.0 TB hard drives (Games, Documents, Music, Pictures, Videos, Recorded TV and Contacts).
ON my ssd Drive Wiper basically freezes up in it's first stage and the stated time incrreases. If I go into safe mode Drive Wiper finshes in under 2 minutes. Drive Wiper works normally on both W.D. Caviar Black hard drive's. This bug didn't exist in the last CCleaner version and Drive Wiper wiped the ssd's free space in 2 minutes.