WD MyBook Firewire 800 and M-Audio FireWire 1814 conflict

I have a big problem with an external HD Western Digital MyBook firewire 800 and a M-Audio firewire 1814.
When I turn on the external HD (connected via firewire 800) the sound card stops to play.
If I don't use the drive everything works, but if I use the external HD the sound stops again.
If I connect the external HD via firewire 400 or usb2 the soundcard works perfectly ...
I think there is a conflict in some driver but I do not have any soundcard (firewire) or any other external drive (Firewire800) to check WHERE is the problem.
I have the same problem in both my Macs (iMac 24 Aluminium and MacBook Pro 17")
Does anybody can help me? Am I the only one with this problem?
Do I have to complain with Western Digital, M-Audio or Apple Inc.?
Thank you for your help!
Carlo

Thank you Chris, I just wonder why Bee Jay can use the HD FW800 with the M-Audio Firewire interface without problems.
I use the ext HD for backup too, but sometimes I need to find something in my backups and I have to turn off the audio interface and copy the files on my internal HD ... then turn off the drive again and turn on the M-Audio ... it's very annoying.
In some forum I read that the problem can be the firewire chipset, but my iMac has the Lucent and the MacBook Pro has the TI (reccomended by M-Audio) ... same problem on both machines.
I did some test:
1) If I use the FW800 external HD and the FW400 with iMovie and my Video Camcorder I have no problem at all. I tried to use the HD at maximum (during a time machine backup I was copying other files and saving the HDV files in the same external HD) and everything works perfectly without loosing a single frame.
2) If I connect the HDV camcorder to the M-Audio interface I cannot even start the capture ... I have to turn off the external FW800 HD.
It looks that the problem is definitely in the M-Audio Firewire driver but unfortunatley the M-Audio e-mail support is only for US customers ... and I'm Italian.
Is there any US customer that has this problem and can insist with the M-Audio support?
Maybe they can solve it in the next release ...
Thank you in advance.

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