Installing Fedora 3 on USB Hard disk;

[Mirco Scaramucci]

I have a USB hard drive connected via USB2 port on my Pentium IV 2.6GHZ 
Dell Optiplex GX270
I am tryin gto dual boot with Windows XP at the moment while awaiting 
Fedora Core 4.
Unfortunately Anaconda doesn't seem to be detecting my USB hard disk 
although during initial graphical boot it does seem to be loading two 
USB driver of which one is for USB mass storage, which would make you 
think that it is detecting the external hard disk.
Unfortunately when I get tothe stage of having to chooose the hard disk 
I want to install fedora on i only get the option of the internal hard 
drive.
Has anyone encountered this problem before?
Is there any thread on fedora core mailing list where this problem was 
dealt with. I f so can anyone please send me the link to it?
Thank you very much.

Mirco