DS411, NAS Home to Corporate Workgroup, 4X 3.5"" or 4X 2.5"" SATA(II), USB 2.0 port X2, eSATA X 1, Max Capacity (Internal HDD): 12TB (4x 3TB hard drives), Max Supported IP Camera: 12, RAID JBOD/0/1/5/6/10, CPU Frequency: 1.6GHz, 512MB DDR3