Buffalo Tera Station III is a larger capacity NAS device with robust RAID 5 capability. The redundancy of four separate hard drives in RAID 5 or RAID 1 modes mean that even if a hard drive fails, your data is safe. With Hot Swap functionality, if a drive does fail, the Tera Station III automatically powers down the faulty drive, enabling you to safely remove & replace without losing any data, or down time. The replication function allows the connection of a second Tera Station via LAN port & replicates the data to improve reliability, fault tolerance or accessibility. Please note: networking components such as switches, routers, NAS & wireless devices require that speeds & standards be consistent throughout the network to gain optimum performance. To avoid compatibility clashes or for advice, please contact us on solutions@ebuyer.com.