Buffalo"s TeraStation 5400DN is a high performance four drive network storage solution ideal for businesses and demanding users requiring a reliable RAID-based network storage solution for larger networks and business critical applications. Increased reliability is achieved with the Testation 5400DN being populated with hard drives built specifically for always on NAS devices. With the powerful Intel Atom D2550 processor, TeraStation 5400DN provides exceptional performance during file transfers and everyday NAS functions. TeraStation 5400DN runs many services simultaneously and the dynamic combination of the dual core 1.86 GHz processor and 2 GB DDR3 RAM enables the acute ability to focus on concurrent tasks with minimal performance degradation. TeraStation 5400DN is packed with business class features such as Active Directory support, disk quota support, share level replication, failover support, dual gigabit Ethernet ports, hot-swap hard drives, iSCSI targeting and USB 3.0 accessory support.