Target disk mode on RAID'd boot volume

[Bill Whitacre]

I think I may have outsmarted myself.

I put a 2nd HD in my wife's computer and set it up as a mirrored RAID  
boot drive so that if one drive went bad she wouldn't loose any data.

Now I'd like to replace her computer and am not able to boot the old  
RAID'd startup volume computer in Firewire target disk mode to  
transfer everything to the new computer.

So I'm holding down the 'T' key and rebooting her machine and it  
won't go into target disk mode.

Yikes!  I have Googled but can't find anything that say one can't  
boot a RAID'd startup volume in FW target disk mode.

If is is not possible to boot her machine in target disk mode, what's  
the next best/easiest way to get all her accounts, software & files  
onto the new box?

Thanks for your patience.

bw

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Bill Whitacre
bw at his.com