QNAP TS-669-PRO 6-Bay NAS, SATA 6Gbps, USB 3.0 Centralized Storage and File Sharing Backup Center for Business NAS, iSCSI/ IP-SAN Storage Combo Solution for Server Virtualization iSCSI and Virtualization Deployment Feature-rich All-in-one NAS Applications Private Cloud Storage for Ease of Deployment Exceptional Performance: 221.8 MB/sec Reading, 220.8 MB/sec Writing SuperSpeed USB3.0, SATA 6Gb/s Supported Energy-efficient & Eco-friendly