G-RAID upgrade 4tb to 8tb or12

Hello, i want G-RAID (0g02289 GRATHNB40002BAB) 4tb upgrade to 8tb or 12tb.
Can i replace with 4x4tb or 6x6tb will it work? I cant find info if it suport hdd 4 0r 6tb size, and what hdd suports.

Yes you could replace the drives if you wish. It would be any HGST Ultrastar drive however the RAID for that unit was handled by the Disk Utility on the Mac. It is a software RAID.