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Backstory: There is a drive that comes to mind out there that has two FireWire 800 ports. My question is related to performance of the second port. In my case, I would like to hook up an external sound card to my MacBook Pro. I am already maxing out my USB ports with other devices and I and using Thunderbolt to power another display. So my only option is to use FireWire, which is the choice anyways.

Question: Will using a dual FireWire 5400 RPM HDD with the additional port (daisy chain) affect the stability, quality or bus speed to the external sound card?

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It shouldn't. FireWire is a peer to peer technology

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