FreeBSD 6.0 && fdisk = bad disk geometry ?

[Theorem]

I'm having trouble setting up a new RAID5 array.  It's a RocketRAID 1740 with 4x 
500G disks, in RAID5 this gives approx. 1.5T of space.  It looks like it's 
operating properly on /dev/da0 .

Unfortunately, when I go to FDISK this via /usr/sbin/sysinstall I see the same 
error over and over and over trying to set my disk to the right cycls / heads / 
sectors.

here are 2 screenshots of the messages :

http://i7.photobucket.com/albums/y260/theorem21/manual_set_err.jpg
http://i7.photobucket.com/albums/y260/theorem21/repeat_set_err.jpg

Even trying to set the disk manually gives the "repeat_set_err.jpg", so I can't 
possibly have a correct disk geometry.

Can anyone help me out ?  Any suggestions are welcome, I don't know if ignoring 
this is the best option.



Thanks,

theorem