After reading your post I decided to try it again. It turns out I was using the hard drive builder firmware. The command prompt was just a Bash 2.0 for the builder and the rom command did not work. I think I messed up the hard drive (it was only the stock 10 GB), it will not mount anymore, it gives me mounting errors in hyperterminal and in jemplode it says I has 0 space.

Im going to wait for my 160 GB hard drive (with a 5 year warranty, btw) to ship in before I try this again.