1. AORT parititions:

      /dev/hda1  - linux swap
      /dev/hda2  - RH73_plain
      /dev/hda3  - RH73_rt (Redhat 7.2 RTLinux 3.1 ) (*default)
      /dev/hda4  - RH62_rt (Redhat 6.2 RTLinux 3.0 )

   Boot in RH73 to do any grub reconfigurations.