Ok I did Try it as Root and still did not work, Also I have the Dev tools installed, the error I get is Command not found.
I just Noticed you have it originally like this:
sudo ./Developer/Tools/SetFile -a V /Volumes/swap_name
and Now I see it it like this...
I tried the above suggestions but nothing, what could I have done wrong. I have the Dev tools installed and typed in exactly what you have. I get an error about "cannot find / or does not exist something like this"