Firewire is daiychainable. There is no priority of service to any device on the bus so to speak. Hope this helps.
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You might consider using a USB hard drive. Conventional wisdom is to attach the DAC and EHD to different interfaces, DAC on USB and EHD on Firewire or visa versa. I am getting great results using USB EHDs on a MacMini 09' with a Wiess DAC202 and on an iMac 08' with a Metric Halo LIO8. This configuration dedicates the Firewire interface to your DAC and the cost of switching from Firewire to USB EHD is minimal when compared to your DAC investment.
I've found that SOME firewire hard drives do not daisy-chain in an ideal manner. For example, if the device that is at the beginning of the chain (i.e., connected directly to the computer) is not powered up, the other device(s) in the chain may or may not be visible to the computer. Also, if the device that is at the beginning of the chain is not turned on before the device(s) that are connected later in the chain, those other devices in some cases may never be detected by the computer, until power is recycled in the opposite sequence (although that experience is with Windows machines; Mac's may be better in that respect).
In general, firewire hard drives that are described as using an Oxford chipset are to be preferred.