I'll tell you what happened with Speed Disk.... sit down and pull up a chair (or vice versa if you prefer).
3:00a - Schedualed start
7:00a - 7%.
6:00p - 12%.
6:30p - 12%. Nix installs The Sims while defrag is running. The drive was already chock full of shit to burn, it's a 30GB drive (27.8 really, stupid billion bytes!) and had less than 1.3 GB free before she installed The Sims.
10:30p - 12%. After dropping Nix off, I checked to see how far Speed Disk had progressed. Yup, still at 12 freaking percent! It hadn't moved one inch and wasn'te ven doing anything. I still don't know if it ever would have finished, I then exited it, saying I would do it when I get some 80min cds to burn the 20 GB of games and music sitting on my drive. I figure it's prolly not even safe to run defrag on a drive with 6.4%, might make smoke come out something!