PowerApp 120/1550 Install problems

[Minnesota Slinky]

Hey list,

I'm trying to install FreeBSD 6.2-RELEASE on a Dell PowerApp 120  
(1550) I just purchased.  The system claims to have an AIC 7899 SCSI  
host adapter.  I've currently got a known-good 9GB Fujitsu hard disk  
in the system, as ID 0.  During installation, the disk comes up as  
da0.  After going through all the options for install, etc, I get an  
error when it tries to write the file systems:

"Unable to find device node for /dev/da0s1b in /dev!" and mentions  
that installation is aborting.  At first I thought it was a problem  
with the SCSI backplane, but RHEL and Window 2000 Server both install  
and operate without problems.

Thanks for your advice!

Eric Crist