Firewire RAID woes

[theviceofreason]

This is my first post on macosx.com, so first of all, hello everyone.

Now to exploit your knowledge.

I have a Formac 500 Oxygen firewire hard drive which I've been using for a couple of months now with my Rev B iMac G5 20". It's quite a LOUD drive what with the constant fan running so I only power it up when I need to shift some of my eyeTV recordings off the Mac's main drive to free up space.

I found myself in this predicament today and switched on the drive - to be told it wasn't a recognised volume and asked if I wanted to initialise it.

This is a RAID 0 drive made from two 250gb disks and Disk Utility sees both disks, and the RAID, but now insists only one of them belongs to it and the other is unformatted.

Is there anything I can do to get my data off this, or to restore the RAID?

Any help much appreciated,
Andy

EDIT: I forgot to mention that I recently updated to OS X 10.4.5, that wouldn't have anything to do with it, would it?