Synology DiskStation 4-Bay (Diskless) Network Attached Storage DS412+ (Black) CPU Frequency: Dual Core 2.13 GHz Memory: 1GB DDR3 4 Drive Bays, Drive Type: 3.5" SATA(III) / SATA(II) HDD, 2.5" SATA(III) / SATA(II) HDD, 2.5" SATA(III) / SATA(II) SSD Max Internal Capacity: 16TB (4x 4TB HDD) External HDD Interface: 2x USB 3.0 Ports, 1x USB 2.0 Port, 1x eSATA Port. LAN: 2x Gigabit.