I have installed Fedora 23 (XFCE), FreeBSD and GhostBSD on flash drives for mobile conditions with my Toshiba C55-A5126 and they all work.

I want to create all of these and Slackware 14.1(+whenever) on a partitioned 10TB USB drive.
This I know:
Slackware requires disabling of Secure boot but apparently works with GPT drives and UEFI.
Fedora 23: works with Secure Boot and UEFI
FreeBSD: works only without Secure Boot and not with UEFI (must use CSM)
GhostBSD: works witout Secure boot and with CSM

How do I set up Grub to handle this combination on the 10TB drive?
I would prefer not to constantly giggle with the boot features if at all possible. Is this possible?
Can I create 1 set of partitions to boot withut UEFI for one group of OSs and a 2nd partition set to use UEFI? No thanks to M$ and watch out if U use bash as M$ has apparently given up on its in house equivalent and is supporting bash. They will attempt to revise it Ugh!! Thanks

FreeBSD boots with UEFI since 10.1.

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Will check that when I get back to the house. Thougt I bought the most recent via OSdisks.

Hi,

For Slackware, you may want to look at; http://docs.slackware.com/start

Plus AlienBob does have SlackwareLive ISO that you may find useful. Look at; http://docs.slackware.com/slackware:liveslak for help.

Hope this helps.
Have fun & enjoy!

You can "roll" FreeBSD to the version you wish.

@Emerson: Would U explain your meaning of roll-ing FreeBSD?
I have a 10.2 version on a liveDVD. I tried installing from it to a flash drive under UEFI boot mode with/without Secure boot and could not get it to go. Could it be that the flash drive was not formatted GPT? If anyone has a magic potion to drink before doing this under UEFI I would like to know what it is. I have installed both FREE and GHOST under CSM boot mode cuz I couldn't get either to install otherwise. I am not new to OS installs fwiw. Thanks.