Firewire device causing problems when connected to Mini via LaCie ExtHD/Bus

Hello there..
Just bought LaCie 300GB Ext.HD/Bus(Firewire &USB). It was recognized by my Mini no problem. I have used the firewire connection between The HD and the mini. The problems begin when I try to connect my M-Audio firewire audio interface (it's mains powered, by the way) to one of the firewire bus inputs of the LaCie - then every action gets the dreaded spinning beachball and I have to shut down etc. The connection of this device has even prevented the HD being recognized by my system, in the case where I have tried having it already connected and powered up before switching on and connecting the HD to the Mini.
I've tried other things such as PMU reset, to no lasting avail.
This is the same firewire audio interface that has worked fine for months when plugged directly into the Mini, so why should there be a problem when it's connected to the bus port of the HD?
Now, as a temporary solution, I have changed the connection between the Mini and the HD/Bus from Firewire to USB - this means I can now use the FW port on the Mini to connect my audio interface (as before). The problem with this is that I work alot with video as well as audio, and have learned that it's very advisable to use firewire drives when working on video...but there is only one FW input on my Mini, so if the La Cie HD is using that, there is no port for audio interface to go in...that's why I bought this particular HD - more storage on a FW HD which has extra FW bus ports for such things as audio interfaces!
I hope I've explained the problem OK, thank you in advance for any advice.
Jimmy

You don't mention which model you have, but this is from the M-Audio Firewire 410 Manual Troubleshooting section:
The FireWire 410 has been designed to give you high performance and professional quality audio. It has been tested under a wide range
of systems and operating conditions. In the real world, however, there is a nearly infinite number of possible operating scenarios, any of
which could affect your system’s performance. Much like owning an automobile, “your mileage may vary.” This section can not begin to
cover all possible issues you may encounter, however we want to give you some suggestions on common problems you may experience.
One thing to avoid is connecting too many devices. The FireWire bus is a dependable, high-speed, high-bandwidth protocol which is ideally
suited for digital audio. Nonetheless, it’s important to remember that audio and multimedia streaming places considerable demands on
your processor and the FireWire bus. Although it is theoretically possible to chain many multiple FireWire devices in series, doing so may
potentially degrade your audio performance.
I guess this degradation could also affect the Firewire HD. Maybe there is a simple fix, but it sounds like the M-Audio people have been down this road before.

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