Ext Hard Drive Prolific PL3507 Chip Set: Can't boot OS from Ext Drive

I can not get my supposedly Mac compatible Ultra (uses the Prolific PL3507 chipset) external hard drive enclosure to start up as my OS. Tried the FW and USB ports....
Help!
thanks
tc

Thanks for the response!
Yes, used DU to partition the drive for HFS extended journaled....
No, I intalled the OS via the OS install disc...
Yes my drive is visable and accessible and mounts readily...I can't move files back and forth etc....but when I try to boot via Firewire I get a grey screen as the PB searches for the OS....I eventually have to hard shut down the computer and reboot with the drive disconnected and use the keyboard during the reboot to get it to boot back on the PB.
I have found some threads on the web that say the Prolific is not the best....the tech support at Ultra tell to ask Apple for the latest driver....but it is their product...So that doesn't seem to be going anywhere....
thanks again
tc

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