ESata - is that a seperate bus from the FW800 port?

I'm thinking of sometimes booting from an external FW800 drive, and having video data on another such external drive. One using the FW800 port, the other the eSata port with a FW800 card.
If I were to daisy chain them they will be using the same data bus, so I figure that by using the eSata port I'll get a gain in performance.
Am I correct in believing this? Any tips, like which to have the OS on, and which the data?
Cheers!

Your comment is a little confusing. You can connect a FW800 drive directly to your FW800 port. As you have a 17 MBP, you have an express card slot. You can get an eSATA express card that will allow you to connect an eSATA drive. They would not be sharing a data bus. Daisy chaining two FW drives will share the FW bandwidth. If that's not what you're asking, please clarify.

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