Starting a new thread as the last related one "Re: Grub install broken after kernel update" seemed to be generating more heat than light. The problem (which seems to be similar to another one mentioned in the thread mentioned above): Installed a new larger/faster SATA disk, copied/configured/booted FC3 installation, and attempted to reconfigure grub to use the new /boot partition. Attempting to run grub or grub-install to update boot record results in "Segmentation fault". The old MBR is not changed. Cannot create a grub floppy either due to segfault, although a grub floppy created on a i686 system can be used to boot the x86_64 smp system, as can the instance of grub created by anaconda on the original SATA disk. Not sure if this may be an x86_64smp, or a SATA problem, or ???. The problem has persisted through multiple kernel upgrades. Details can be seen in the Bugzilla report https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=147600 Any suggestions appreciated, as would be any comments or action on the Bugzilla item. Thanks, Phil