Hello, yes it can support up to 20 TB.   20TB, HDD, 7.2K RPM, 3.5 inch, Non Encrypted, SAS12, 512e, Enterprise Class
Does anyone out there know if the PE R740XD 12 LFF server will support the Dell 20TB NLSAS 12G LFF HDD's?  Thanks!
Dell PowerEdge R740XD 12 LFF