Overloading the Firewire Bus?

I am having troubles with having a Canon GL2 video camera being plugged into my iMac G5 via Firewire and a LaCie 250 GB external harddrive being plugged into my iMac G5 via Firewire at the same time. If they are both plugged in via Firewire at the same time, my iMac either a) freezes up thinking, b) doesn't detect my Canon, or c) doesn't detect my LaCie. I spent many hours speaking to Applecare and LaCie tech support and the only sound reponse I got (which was from LaCie) was that I was overloading my Firewire bus. Is this truly what's wrong? If it isn't give me your input and how to solve this thorn in my side, and if it is, tell me how can I transfer video smoothly from my Canon to my LaCie through some other means.
Thanks in advance.

Have you been able to transfer Canon to internal drive directly, or are you trying to send it through software to the FW drive indirectly with some form of compression etc. Also have a look at any La Cie software possibly installed and disable it. You dont need it to run a FW drive generally speaking and it may have interfering preference settings. My thoughts only, cheers.

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