Synology DiskStation 2-Bay (Diskless) Network Attached Storage DS712+ (Black) CPU Frequency: 1.8GHz Memory: DDR3 1GB Internal HDD/SDD: 2x 3.5" or 2.5" SATA2?(Hard drive not included) Max Internal Capacity: 6TB (2x 3TB HDD) External HDD Interface: 3x USB 2.0 ports, 1x eSATA Port LAN: 2x Gigabit