I'm booting from a 250GB SSD and want to add the 3TB HDD for storage. Do I use GPT? Based on what I've googled I need to use GPT because MBR won't work with drives that are larger than 2.2TB. However, I don't see any guides that explain adding a HDD when I'm not using it as a boot drive. Admittedly my google-fu is wonky lately so I may have missed something basic. Any ideas?