Safe Boot not allowed on software RAID0 boot volume?

[sailmac]

I am running a software RAID0 stripe ( 2 x 640GB WD Caviar Black) as the boot volume on my Mac Pro (early 2008). The striped volume was created using Disk Utility.

In normal operation the system boots fine and the volume behaves well.

I tried booting into 'safe mode' (hold down shift key at boot) but the system failed to boot. The grayscreen gear spun for awhile, then the Apple logo turned into a "no startup disk found" icon and the gear kept spinning.

I let it spin for a few more minutes, the did a hard shutdown (followed by DU/DW to make sure no corruption from the shutdown).

Tried again and got the same behavior.

Is 'safe boot' prohibited on a software RAID0 stripe?

Thanks

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System details

Model Name: Mac Pro
Model Identifier: MacPro3,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.8 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 12 MB
Memory: 12 GB
Bus Speed: 1.6 GHz
Boot ROM Version: MP31.006C.B05
SMC Version (system): 1.25f4

System Version: Mac OS X 10.6.2 (10C540)
Kernel Version: Darwin 10.2.0
Boot Volume: Mac Pro 1
Boot Mode: Normal
Secure Virtual Memory: Not Enabled
64-bit Kernel and Extensions: No