Need help with one step of Echelons Self-Boot tutorial.

[Kramer]

K so far I did everything right. I hacked the 1ST_READ.bin and everything. But i am stuck at this part:

13) Your next step is to run MKISOFS and make a ISO out of these files. Run the following command while you are in your "selfboot" root directory:

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

"x,y" should be the numbers outputted to you from cdrecord -msinfo
earlier. My values are 0,11700

Whenever I try to run this command mkisofs does nothing. It doesnt create any data.iso I am trying to make a self-boot of house of the dead by the way.