I installed Xen on a machine with a built in Adaptec RAID controller. During the initial install, the second SATA drive was turned off in BIOS. After the complete Ubuntu Hardy and Xen install, I created a virtual machine that operates as a Samba server. The virtual machine uses a third drive in the machine that is IDE and writes to the disk (NTFS partition) rather than to an image file. There is another partition on this IDE disk that contains an old 7.10 install of Ubuntu. This all works fine. Then I enabled the second SATA drive in the BIOS and turned on the RAID controller in order to build a RAID 1 array. This went fine as well. After the reboot however, the partition containing the 7.10 Ubuntu on the IDE drive is the one the computer starts to load. If I turn the RAID controller off, the computer boots from the 8.04 version on the first SATA drive. Any suggestions?