Startup Disks Not Showing

I'm running 10.4.11 on an iMac with one internal drive. I have 2 external firewire drives connected both with boot partitions running 10.3.8 so I can use NetRestore to clone our lab. The problem is that when I select "startup disk" from the system prefs only the internal drive shows up even though both of the external partitions are mounted. I tried this with a different external on a different computer and it still does not work. I do not know what is going on.

A couple more questions: what kind of external drives are you using?
How did you create the boot partitions and how did you prepare the disks?
- cfr

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