Geometry Incorrect on FreeBSD-5.2.1 installation

[Forrest Aldrich]

I've a SOYO Dragon Platinum Edition motherboard, with SATA drives.   
According to FreeBSD's installation process, my geometry is incorrectly 
set.  So, I did as it asked, rebooted into the BIOS and retrieved the 
figures:

Cylinders:   38309
Head:          16
Pre:               0
LandZone:      38308
Sectors:        255

I  selected the "G" command from sysinstall's menu to set the geometry 
manually:  38309/16/255 (cyl/hd/sector) and it still insists the figures 
are wrong.  It's defaulting back to what it believes is correct: 

9729 cylinders
255 heads
63 sectors

These are 80gb SATA drives.  The BIOS is set to run in IDE Enhanced mode 
(I believe).

I did a test installation and it worked, except the dreaded GRUB loader 
(from a linux test install) keeps coming up (fdisk /mbr does NOT get rid 
of it)... I don't know if that's the cause of this problem (doubtful).

Any clues as to what might be wrong?   The BIOS is AMI/Phoenix, and is 
up-to-date.


Thanks.