Adding a XP disk to FreeBSD machine

[Rico Secada]

Hi

I have a box running FreeBSD 6.2 on ad0. 

I have another HD which used to be in the same box running XP. I set
this drive to slave and installed it into the box in order to dualboot. 

On the bootmenu the new drive ad1 shows up:

F1  FreeBSD
F5  Drive 1

Pressing F1 boots the disk on ad0 with FreeBSD, but pressing F5 also
boots ad0 with FreeBSD.

How can I make this work?

Best regards.

Rico