> My plan for my 4TB drive was to run many different OSes on it, each one
> bootable separately from BIBM. Unfortunately, it seems that is unworkable
> due to BIBM limitations on GPT....however, I'll just chainload all the
> other boot loaders from the primary one, so it's clunky but not the end of
> the world
I have never chainloaded bootloaders, so I don't know how usable that will be. But if it turns out to be too inconvenient or error prone, another solution would be to retain your 4 TB drive, but partition it as MBR/EMBR, which would limit you to 2 TB. You should be able to use BIBM to multiboot, and you would not have to purchase any new hardware (but obviously you would not be getting full value out of your 4 TB drive).
-- from CyberSimian in the UK