Convert MBR Partitions to GPT

[Thomas D. Dean]

I have 5 disk drives, with two (same) OS's.  Actually, two drives have 
Windows 7 and its secondary plex.  From an earlier post:

sata6g_1  HD0 SSD    ubuntu 18.04
sata6g_2  HD1 WD5000 Ubuntu 18.04
sata3g_3  HD2 WD5000 windows 7 - not used
sata3g_4  HD3 WD5000 backup
sata3g_5  HD4 WD5000 windows 7 secondary plex- not used
sata3g_6  DVD DRW-24B3LT
sata6g_E1 (empty)
sata6g_E2 (empty)

I plan to keep the SSD Ubuntu install until I can get FreeBSD up and 
running the way I want.

So, for now, I want to install FreeBSD on sata3g_5 HD4.

My motherboard, ASUS P9X79 PRO has support for UEFI boot.

Is it worth the effort to change everything to GPT, or, should I just 
use GPT on the FreeBSD disk?  I am leaning toward the later, but, ...

I think the future has a SSD for FreeBSD.

Tom Dean