Can't Mount 'Volume'

I need to delete some files that are on a "volume" that I cannot access through Finder. It's not mounted on the desktop either. What happened was I had several files (a disk image taken with "MacTheRipper", two vids ripped w/ HandBrake, and a temp torrent file) accidently stored differently than I normally store them. I know they are there 1) b/c 15gb of my HD are suddenly gone, and 2) when I use iTunes to import new files, it automatically goes to this folder where they are....so I was able to add the HandBrake files to iTunes at least.....but I want to delete that stuff, and I can't seem to get to it. I have the path for it (HD/Volumes/.....etc) and was wondering if there's a back door or whatever to remove it. Thanks