PowerEdge T410 harddrive issues

Hi everyone i have a dell poweredge T410 and i have made huge upgrades to it orignial it was a series 1 motherboard with 5430 processors in it and 8gb of memory,}
now it is a series 3 motherboard with 2 (paired) 5570 processors and 128gb of memory,
now that you have the specs  lets move onto the issue at hand, i am now in the process of buying hard drives for my system and i received the very first of 3 4tb Nas Hdd but after installing my hard drive in the hot swap bay it only shows 2048Gb of avaliable space, after some research i found that the HDD was labled MBR and i should relabel it GPT after doing so my hard drive still displays the same amount of space, is 2tb the max for this system and if not how do i fix my issue i have tried multiple updates from dell and acccording to all of those updates they are not compatiable with my system so idk what i need to do but i defintly need all 4 of my TB