I don't think so. GRUB only needs to be installed on the master boot record of
the first hard drive (or whatever media you have decided to set as the boot
media- this is usually /dev/sda or something of that sort), and (if configured
correctly) it will be able to boot into any installed operating system on any
other media, handing control over to it. Try installing Ututo on the second
hard drive- it will probably have options related to dual-boot/disk
partitioning in the installer, and will (hopefully) work out of the box,
probably setting up its own grub.cfg. If GRUB doesn't recognise, you can always
rectify the situation by chrooting into the second drive from the first, so you
should be able to get it to work one way or another. Give it a go, and tell us
what happens.
