Buffalo  TeraStation Pro II 1 TB (4 x 250 GB) Network Attached Storage TS-H1.0TGL/R5 TerraStation;Setup CD-ROM; Quick Setup Guides; RJ45 Cable; AC Power Cord; Warranty Statement RAID 0,1,5,10 and Active Directory Support: Works as a client member in an Active Directory domain. Four operational modes: Standard, Spanning, Mirroring and RAID 5 Advanced RAID system to continually check hard drive performance Quick swap hard drive tray via the front panel for easier maintenance