Synology RackStation RS820+ is a compact and scalable 4-bay rackmount NAS and is an ideal choice for remote office or small business with limited office space; sliding rail kit is included for easy server installation Easy to use Synology DSM Operating System has a desktop-like layout and features iSCSI Target, Backup with Snapshot Replication Technology Support, Near Unlimited File Management and Sharing, Digital Asset Protection, Comprehensive Built-In Security Tools, Storage Virtualization Solution Compatibility Ports: 4 x RJ-45 1GbE LAN Port (with Link Aggregation / Failover support); 2 x USB 3.0 Port; 1 x eSATA Port; Memory: 18GB DDR4 Synology RAM; HDD Storage: 32TB (4 x 8TB) 7.2K RPM 6Gb/s SATA HDD for High Capacity Storage Synology NAS chassis comes in a sealed box Hard drives and memory upgrades included separately NOT installed, installation required