Please help, so close..................

[Sisco_1]

Hi,
I've just managed to rip my first game R2R Boxing and am now trying to burn it as a self boot. I have followed the instuctions to the letter, but as i get to the part of making the data.iso with the dos command :

mkisofs -C x,y -V ECHELON -l -o data.iso data

I always get an error message saying invalid directory: ECHELON
If i then delete this command and continue to the end i only end up with a 32kb data.iso.

Any help greatly appreciated!!

Thanks in advance.