Firewire 800/400 Problems Options

[djrucksack]

Hi there.

I've got problems trying to make my firewire devices function to their full capablility.

I have a OWC Mercury Elite Pro Al 250Gb Triple interface external hard disk (what a mouthful!) connected to my powerbook G4 1.5Ghz via a firewire 800 cable to the onboard firewire 800 slot, and it works fine, running at 800 Mb/s.

BUT, I've also got an M-Audio Projectmix which connects with a firewire 400 cable. I've just bought a PCMCIA firewire adapter so that the hard disk and the Projectmix can have their own separate bus, but when I plug the Projectmix in the speed of the Hard disk connection drops to 400Mb/s.

I can't understand why, when they're connected on different buses.

(The whole reason why I bought the PCMCIA Firewire card was to get around this problem!)

Please help!!

Thanks.