Same problem here - with newer disks (200GB Maxtor) no hardware configuration changes helps. Maybe next version of OF will solve this problem. For a moment i've found that there is OF command that perform cold reboot - try reset-all (or it's alias reset) at OF prompt.

And what I think is the OF Forth script that could check the existence of ide devices and if disk/s are where they should be boot the system otherwise do a cold reboot. I'll let you know about the results.