I installed FreeBSD 8.1 on a machine where the drive was
/dev/ad6 but have moved it to a new system where the drive is now
/dev/ad4. The new system boots but I need to manually specify that the root file system is on
How can I change the boot loader to do this automatically? Googling around turns up examples of
disklabel -e being able to change the disk number, but I only get "Class not found" errors and no disk label changes with this method.