Did you by any chance have something on a memory stick or the like that you downloaded to your computer and now want to see if the drive is " clean " ? Is this what you mean?
Sorry if I came across as rude. That wasn't my intention at all. I mainly just wanted to know what you were trying to do by scanning your usb drive with CCleaner.
rridgley, can he scan his usb drive with CCleaner? Or is it as I think that once your memeory stick is wiped clean there is no point in scanning the drive, there is nothing there.
dande, I think hazelnut identified the problem ... "scan" is too general a term
Anyone else feel free to jump in but ...
CCleaner locates and allows you to delete specific types of files (typically operating system and application temp / log / cache folders and files). It also identifies and allows you to fix specific types of registry issues. Neither function is likely to be useful for a non-system drive. If you could specify the file names and path for CCleaner to check on your USB memory, you would know if the files are there.
If you want to see what's on your USB memory, Explorer (with appropriate view settings) will show most things. File recovery software such as Undelete or Restoration will reveal files that have been deleted but not erased.
If you want to erase / wipe / shred files on your USB memory, use a file shredder such as Eraser (or the tool in Restoration).