Dual Booting iDeneb and XP from two HDDs

I'm having a problem with my install. I want to be prompted on the initial boot to choose which drive to boot from, iDeneb, or XP. But my BIOS doesn't recognize both drives at the same time so I have to unplug the one I don't want to boot from otherwise it will automatically boot from the last one it previously booted from. Is there a way to solve this so I'm prompted with both drives and I can select which one to boot from? I have AHCI enabled from the BIOS.

Gigabyte GA-EP45-UD3P Motherboard