Boot problems with fc17 and two disks

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http://forums.fedoraforum.org – Hi, I installed fc17 x86_64 on a 1TB disk and it boots fine. I have an old fc15 2TB disk that I'd like to add to the system without making any changes to the disk itself. This disk was added to the system after the fc17 install. The problem is that when I boot the system with the fc15 disk installed, it boots the fc15 system using the fc17 kernel and boot loader from the fc17 disk. I've tried to switch the boot order in the BIOS, and despite it saying the 1TB fc17 disk is first, it uses grub and initrd from the fc17 disk but mounts the fc15 disk as root and starts to boot from it. (HowTos)