How do I copy from one external HDD to another HDD?

Hi
I have two external hard drives - an Iomega eGo 500gb Mac specific portable drive with firewire and an Iomega 1TB MiniMax.
My problem is that I can only get the iMac to recognise one at a time - never at the same time, and I'd like to back up what I have on the eGo to the MiniMax. I can't dump what I have on the eGo to the iMac HDD first cos it's not big enough.
So...
Please could anyone advise how I can do this? It should be fairly simple if only the iMac recognised both Can I plug the eGo into the back of the MiniMax and do it that way?
Many thanks
Rich.

YES!!!
They both have firewire 800 ports and I plugged the eGo directly into the back of the MiniMax through its 800 port (the MiniMax isthen plugged into the iMac through its 400 port) and they both came up on the finder!
It was then simply a drag and drop.
Thank you so much for that reply - it was most helpful and now my data is safe.
Rich

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