I'm dual booting Debian Sarge and XP right now, with all NTFS disks excepting hdc1,hdc2 and possibly 3 (I don't remember if I set up a /boot partition or not). I was ...
Do the same thing for your other drive, which will be either hdb or hdc depending on how you have things hooked up. Also useful is a 'ls -lR' listing of /boot and the contents of /boot/grub/menu.lst.
Are you a dual-booter running a Linux-Windows or even a Linux-Linux dual-boot system? Have you ever lost booting access to one of your OSes or want to be prepared for if and when that happens? If yes, ...