Sorry to raise an old thread...
I've run drive wiper on my laptop. As warned, it takes a long time. Fine.
Trouble is, if I leave it running my laptop does not seem to recognise it is running and puts itself to sleep. SoI come back 2 hours later to find thelaptop asleep, drive wiper "10% complete" and nothing happenibg.
Wake it up, and drive wiper starts running again. Go off to do some gardening and come back.... laptop asleep and drive wiper stalled at 13%!
Tried leaving it running overnight: waste of time!