IEEE 1394b hdd stange problem

[Ultra Wide]

I got an Acomdata firewire hdd, 320GB one. It works fine under XP SP2, but I get this yellow question sign. I went to the Acomdata site and they said there are no drivers needed for the drive. How can I get this to go away? It doesn't do that when I plug it in as USB, but I rather use firewire since it's less CPU dependent and I can daisy-chain my ipod and to the hdd enclosure.