When going to install Vista on the second drive here with a second partition the installer stalled right when getting to the top of the list where the setup files are then copied to the drive. That was when booting directly from the dvd. When rebooting after deleting the second partition previously used for storage and backing up files off of the XP Home host it went right on over XP Pro and automatically included the Home version in the new boot loader.
The problem now is since the removal to isolate each installation to be stand alone OSs is reinstating as the term goes Home and adding the Pro installation on the new sata in. Even the methods pointed out on the VistabootPRO utility have lead nowhere yet except reinstalling Vista to have it enter both versions of XP. I did come across one article on triple booting XP and ubuntu with Vista that might help.
http://www.hevnikov.com/blog/2006/11...e-boot-screen/