The Supermicro 2028U-TR4+ Ultra SuperServer is a 2U Rack Server with Redundant Power, 24x 2.5" SATA Hot-Swap Bays, and Integrated Quad GbE.
The Supermicro 1028U-E1CRTP+ comes with five heavy duty fans, ten 2.5" hot-swap SAS3/SATA3 drive bays, and Redundant Power Supply.