DS-1220 external SATA (eSATA) Storage Array RAID Subsystem with built-in Port Multiplier and eSATA host interface, supports both 1.5 Gb/s and 3Gb/s Serial ATA transfer rates. Connected to a eSATA PCI-X/PCI card, this subsystem gives your more than 10 times the data transfer speed of an average Network-attached storage (NAS) and massive hard drive space capability. It supports RAID 0, 1, 5, 0+1, JBOD functions, providing a protected, easy to manage, cost effective storage solution.