I also have v6.6 ROMs and I could not get more then 1GB of space to work without errors. I have not tried with 7.0 ROMs yet I plan to as I have the ROM images that I can burn to EPROMs. I would grab HDInstTools and a HD under 2GB and you will be all set. You can use a larger HD just do not make a partition over 1GB, you should be fine.