Synology DiskStation 2-Bay (2X 4TB NAS Drives) Network Attached Storage (NAS) DS215+ 2400 Includes 2 (4TB) NAS Drives approved by Synology; Dual Core CPU Powered by Floating Point Unit; Hot Swappable Drive Maximum Internal Raw Capacity 16 TB (8 TB HDD X 2) (Capacity may vary by RAID types) Screwless Drive Bay Design and Hot-swappable Support; 2 USB 3.0 Ports; 1 eSATA Port Hardware Encryption Engine