boot live iso from portable harddrive

[beaker_]

Hi Guys

I'm making life difficult for myself. Summary, I have a laptop with F10 installed on a portable harddrive (sdb 1-3, i.e., no logical volume) Works great, no complaints so I guess this reduces to a grub question; how do I edit grub.conf to boot an iso on sdb4? Fedora10.iso for example.

Thanks

[RalphCC]

well the conf file is in /boot/grub and you will need to run an editor as root.
Duplicate the lines from title to initrd if you have them, or does it only have a working windows at the moment.
If it does you want something like: (ver = your version number - find the file you have)

title Fedora (ver)
root (hd2,3)
kernel /boot/vmlinuz-ver.fc10.i686 ro root=UUID=id rhgb quiet
initrd /boot/initrd-ver.fc10.i686.img

report back if you have more problems.