Where does it get stuck - in the beginning, in the middle, at the end? I mean, do you see the progress show some percentage?
So you selected "Driver Shredder" (and not File Shredder or Deleted Files Shredder), right? Did you change any settings of the shredder component?
I'm not sure if it can make any difference, but I assume all the drives were formatted as NTFS, correct?