Audio Distortion on FW400 Audio Interface Daisy Chained to FW800 Hard Drive

Hi everyone! I’m an experienced Mac user in need of help resolving FireWire device issues.
I received my 27” i7 iMac a couple of weeks ago running 10.6.2. After a long process of migrating over from my 9+ year old Dual 500 MHz G4 PowerMac tower, I was excited to set up two 1TB drives inside an OWC Mercury Elite Quad-Interface Dual HD enclosure via FW800. I then daisy chained my Focusrite Saffire 10 audio interface (FW400) to the HD enclosure via a FW800 to FW400 converter cable. To reiterate:
i7 iMac (FW800 port) --> OWC Mercury Pro Quad-Interface Dual HD Case with 2X 1TB drives (FW800) --> Focusrite Saffire 10 audio interface (FW400)
Although a lot of people may disagree, I wasn’t concerned about having my FW800 hard drives drop down to FW400 speeds because of the slower audio interface. I have read enough about the 1394 FW protocol and its ability to use something called beta clouds, allowing both FW400 and FW800 daisy chained devices to operate at their maximum speeds. So far, so good. The drives are reading/writing data fast.
As many studio audiophiles have said, you should separate your audio recordings and projects from your startup disk. I’ve done so. However, call me naïve, but I did not imagine that every time my external drives read or wrote data, my audio interface would go into a state of distortion (like raising the gain on a track as high as it can go). When the activity of the disk drops below a certain level, the audio interface usually switches back to clean pristine audio. I am experiencing this within a studio environment and with simple CoreAudio iTunes playback via my audio interface. How is this possible? Am I doing something wrong or is there a blatant limitation with the FW chipset Apple is using for their single bus in the new iMacs? If anyone can provide me with a solution or a convenient work around, I will be very grateful!

Thank you for the feedback, Rick. To shed some light on daisy chaining FW800 with FW400 devices, I provide the following quote from one FireWire technical article I came across on the web:
+"The concept of beta clouds allows FireWire to keep all devices on the bus to operating at their maximum speeds. Devices are cluster together on a logical level in a cloud. The cloud operates as a single block at 800 Mb/sec. The borders of these clouds are where legacy devices are connected, operating normally. Each device operates at its highest speed."+
In short, beta clouds allow both devices to operate at their highest speeds.
Both the audio interface and the external hard drive enclosure has its own, connected power source.
I wish I had the option to use USB2 with my audio interface, but it only has a FW400 connection.

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say I have drive A & drive B together, with drive A plugged into the firewire port on my mac & drive B plugged into drive A. If I only need to work with content on drive B, do I have to have drive A running as well? even if I do not need to work with it?
I notice in mac os that devices show up as no names, well if I need to eject my drives how can I tell which is which when they both show up with the same no name? I dont want to accidentally eject the wrong drives in the wrong order.
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Message was edited by: Sossity

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