The 352UN with 4TB HDD is unique external hard drive that can make up to 2 hard disks with SATA interfaces available for external storage via USB or on the LAN using NDAS. It is compact, sturdy, easy to setup and provides several advantages for the small network or home user that are not possible with more expensive servers. Windows users can assemble the drives in RAID configurations, via the network to create a large disk or to maintain a mirror image of all the data in real time. Network and USB connections are possible from Windows, MAC and Linux computers and multiple Windows based computers can share write access on the LAN.