Synology RackStation RS3621RPxs is an advanced, scalable 12-Bay rackmount NAS built for data precision & protection; sliding rail kit included for easy installation. A powerhouse capable of fitting into small & medium business environments with data-driven, multi-user workloads. Form Factor: NAS Rack Server Internal File System Format: EXT4, Btrfs Ports: 4 x RJ-45 1GbE LAN Ports (both with Link Aggregation / Failover support); 2 x USB 3.2 Ports; 2 x Expansion Ports; Btrfs File System for Advanced LUN iSCSI Service Processor: Xeon D-1531 6-Core 2.2GH z CPU Memory: 64GB DDR4 ECC UDIMM Storage: 144TB (12 x 12TB) SATA 3.5" HDDs for High-Capacity Storage Power: Redundant Power Supply Operating System: Synology DSM Software Provides reliable & safe data security & lightning-fast performance. Supports large multi-user environments while handling data sensitive workloads. Comes in a sealed box. Hard drives & memory upgrades included separately NOT installed, installation required.