External drive enclosure, USB 2 mounts, firewire invisible!

I have a venus ds3 external enclosure with a 300GB 7200rpm WD hard drive inside it. The enclosure works fine with windows and usb2, and it is also detected and mounted on usb2 on my mini (1.25ghz ppc mini). However, nothing happens when I try to use the firewire connection on the mini. In system profiler, I see:
FireWire Device Tree
FireWire Bus
Unknown Device
It is an oxford fw911 chipset, and I did run the updater to FW911V4_00_0000Release.bin, but still no firewire action. The updater saw the enclosure via firewire on my mac, but os x will not see the drive itself.
Am I doomed to using usb2? Would it still be possible to boot from this drive on usb2 instead of firewire?
mac mini   Mac OS X (10.4.7)   upgraded to 512MB ram

problem is
you cannot use 300 gigs as fire wire on any mac mini
the max you can use is only 200 gigs before mac os x
no longer recongnizes the drive
so you need a 200 gig hard drive sorry
Is there some documentation that you could cite on the 200gb barrier?
I'm also interested if it's a ppc-mini only problem or if it affects other systems as well.
I have a 250gig firewire drive on my wife's intel mac mini
and it works fine. Even if it only regognized on 200gig and
I didn't notice, it mounted and worked.
I now have it partitioned into 2 samller volumes. So, if it's
a problem on the PPC mac, then he should be able to
partition the drive and make it work.
I just now tried partitioning it again via usb, and made two 137gb partitions (or whatever odd number it came out to be), and it was still not recognized when I switched over to firewire.
If it turns out that john was right, and nothing over 200gb will work, can I still get some use out of the drive? Can I install applications on it or move the swap files over to it?
mac mini   Mac OS X (10.4.7)   upgraded to 512MB ram

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