ShareCenter Pro 1550, S-Series Network Storage, 4-Bay 1U Rack NAS + iSCSI, 2xGbE, 5xUSB, RAID 0/1/5/6/10, VDD, dual hot-swappable power supply Four hot-swappable 3.5-inch SATA drive bays - supports up to 12TB with 3TB drives Two Gigabit Ethernet Ports Five USB 2.0 Ports - UPS, printer, and external storage support RAID support - RAID level 0, 1, 5, 6, 10, JBOD or standard mode Predictive Data Migration Online Capacity Expansion Virtual Disk Drive (VDD) Expansion iSCSI (up to 32 iSCSI targets)