This is a 4TB Large Form Factor Drive to fit into a Hitachi Data Systems HUS 100 series subsystem DF-F850-DBX.P Expansion Frame 48 capacity drive tray.

The feature code for this unit is DF-F850-4TNX

The part number for this drive is 3285134-C

Installing one of these drives into the DBX tray increases the available capacity of the subsystem by 4TB.