"The QNAP TS-509 is a full-featured and powerful NAS server designed to provide centralized data storage for businesses and enterprise workgroups. The unit offers support for a full range of storage volumes including RAID 0/1/5/6/5 + hot spare as well as single drive and JBOD configurations. In addition to these features, the TS-509 offers RAID level migration and volume expansion that not only allow you to add additional drives but to replace existing drives with ones of higher capacity. These features ensure the unit can grow along with your storage needs. Additional features such as dual LAN connections with failover and load balancing only add to enhance its attraction as a solid business-oriented storage server. The unit also has several features for sharing multimedia files and other functions such as a Web server and automatically downloading files. These features may be more of a nod to the serious non-business user, although that is not the primary target market."