Congratulations for a very nice "Wipe Free Space" feature, which is surprisingly fast.
In the CCleaner window, during this operation, we read
Advanced
Wipe Free Space
% [MB of MB]
It would be very convenient for the user if this box also indicated the Drive or Partition being processed at the moment, so:
Advanced
Wipe Free Space - Drive (H)
% [MB of MB]
Thank you very much to the Piriform people