Only One FireWire Jack on MacBook Pro - will daisy chaining work?

So I installed L8 on my MacBook Pro and put all the Content and GarageBand Loops on my external Lacie drive via Firewire. I also plan to record to the external drive via FireWire. However I also connect my Onyx 1640 to my MacBook Pro via Firewire.
I've only one FireWire Jack on my MacBook Pro but need two. Is there a work around for this? Can I just plug my Onyx into the External HD and only the HD to my Mac? (Is this daisy chaining?)

Daisy chaining as you described is possible with firewire (as long as you have a device with two firewire ports, of course!), but too much I/O and you can saturate the firewire bus. (How often this happens in reality, I don't know. Anyone?)
If your MacBook Pro has an express card slot, a solution might be to buy a firewire express card/34. That way, you can have the audio interface on the firewire bus, and the hard drive on the separate express card bus. I also think most of the firewire express cards come with TWO inputs, so you'll even get an extra.

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