I too need to install Fedora core 6 on my external USB HDD.
With initial hack with the Fedora core 6 installation, I think it recognizes the IDE hard drive only.
This is because the installation script is written in such a manner so that it only loads the kernel modules for "IDE ONLY"
I was able to install Ubuntu on the same USB HDD (Note : with the same BIOS configurations) and did boot it successfully
anyways I am a Debain fan will get the Debian DVD's in a few days. FC6 will not be of any use so any takers for FC6 DVD ?
I hope not the Debian installation script makes the same mistake as the FC6 installation script makes.
Then eventually I need to know a kernel hack which will enable the USB mass storage detection
May b I have to figure it out how Ubuntu does it, I might be wrong but its worth a hack