Question about separate samples drive

[dirtboy]

I have a Macbook Pro running Logic 8 as a second machine for travel work. I need to take my entire samples library (EXS/Kontakt/Drumagog/Ivory, etc.. currently on a separate drive in my Mac Pro Quad) with me for an upcoming project. I was thinking of having it on a small external 7200 rpm drive since I don't have the space on the Macbook Pro internal drive. Here's my setup: Fireface 400 on the MBP firewire bus, audio record drive on a firewire pci express card so both can be on separate buses. My question is this: should I daisy chain the samples drive off the FF400 or off the audio drive? Is anyone doing this type of setup and can it actually work? Any feedback would be greatly appreciated! The Macbook Pro specs are: 15" 2.33 core2 duo, 3 gigs RAM, Tiger latest rev.