installer unable to find device node

[Martin Smith]

I am attempting to install a recent snapshot on a Biostar GF7100P-M7S 
mobo, with an atapi cdrom and on sata hd, after setting up the slices 
and selecting the install medium I am presented with the following error:

Unable to find device node for ad4s1b in dev! The creation of 
filesystems will be aborted.

This also happened with an 8.0 installer, is this just me, is there 
something funny about this motherboard?
-- 
Martin