Synology RackStation 4-Bay - Diskless 1U NAS Rackmount Network Attached Storage (RS812+) Scale up to 8 Drives with Synology RX410 Average 205.67 MB/sec Reading, 176.37 MB/sec Writing 2 LAN with Failover and Link Aggregation Support Fast Motherboard Swapping Design CPU Passive Cooling Technology & System Fan Redundancy Windows ADS and ACL Support VMware/Citrix/Hyper-V Compliance Running on Synology DiskStation Manager (DSM) This item is non-returnable