FREEBSD-5.3BETA hard hang during hardware probe from CD

I downloaded the miniinstall and booted it.  The install booted alright 
and started probing hardware.  There is a hard hang at the point it 
attempts to probe my DVD reader/burner [on acd1].  I have to pull the 
power.  There is a message indicating an ATAPI delay of 30 and 50 
microseconds before the final failed probe.

Since I can't give debug output of any kind from the install CD, I can 
only list my current hardware. 

I have a Dell  Dimension 8250 with 512MB RDRAM and a true Sound Blaster 
Live 5.1 card (rather than the software driven version that they ship 
with this thing).

Thanks in advance,

Tom Veldhouse