I'm facing this problem and this has happened to me multiple times on different machines. I have two hard drives in my system (lets say HDD A and HDD B). I boot the system from the oVirt node CD to install it. Now I want the bootloader and the node installation both to go on HDD B and not HDD A. When I get to the screen which asks me to select the hard-drive for bootloader I use the arrow keys to select HDD B and press Enter (have also tried pressing space or just use tab and continue while it's selected). Then I get to the screen asking where to install the node. I select HDD B and unselect HDD A. I keep the partitioning setup as default ( have also tried manual and kept 5GB unused on HDD A). When I get to install part. It installs the node fine on HDD B as expected but it always gets the boot-loader on HDD A. This issue has wasted many of my days on different machines and I can't seem to find a way around.