Kenny_G1892,  With the T310, with SATA, technically the 6TB drive hasn't been tested, but there isn't a current limitation. Currently the largest we offer for the T310 is a 4TB drive. I would say that it should work, but remember that with certain OS's, there is a 2TB limitation. 
I would like to put a 6TB SATA HDD into a Dell PowerEdge T310 but before i buy the drive i would like to know if it would work. I don't want to use RAID i just want to attach the drive using SATA. On the tech spec for the server it says that SATA is 2TB but maximum internal storage is 12TB.  
PowerEdge T310 maximum size Sata HDD