Mac OSX 10.4.8 Update Breaks Raid Striping -- System will no longer boot

Hi,
I'm a newbie from the PC world with a Mac Pro. For the last 8 hours I've been trying to get a Raid-0 configuration to work with no success.
The Raid array constructs ok and the system boots. Once that's done the Software Update screen arrives and I would select install all... then the machine would not boot. I get a Grey Shade like affect and the message to power off and restart. Powering off does nothing.
So I started again for the Nth time and added each Software Update individually. All loaded and rebooted successfully until the 10.4.8 Update.
As soon as that loads, installs and restarts the machine will not boot.
I called Apple's Tech Support and they told me they do NOT support RAID on this machine. I said what are you talking about. They put me on hold talked to a supervisor and came back with the same story. I just don't get it...
So anyone have any insight and advice on why the update breaks my Raid-0? What can I do to get over the problem (I'd like to have the RAID...)?
Thanks for the assistance.
Mac Pro   Mac OS X (10.4.8)  

Yes, you needed an emergency boot drive anyway to repair your RAID boot drive. Just use the same one in addition to a working clone or backup of your regular system.
Apple made it easy to install or update security updates and system updates from an alternate drive (but you will have to use the stand-alone (combo preferably) updaters instead - which many use already as normal part of upgrades for years now (they seem more useful and reliable).
My preference is a dedicated boot drive with OS and apps and minimal home directory - no media files - and fast, like 10K Raptor. I use RAID for my home directory so it isn't on the boot drive for years to improve performance and keep the OS separate. Never a problem and nice mix.

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