Buffalo DriveStation Duo 2-Bay 6 TB (2 x 3 TB) RAID USB 3.0 Desktop Hard Drive - HD-WL6TU3R1 USB 3.0 supports backward compatible with USB 2.0 Dual drive storage Support for RAID 0, 1 NovaBACKUP Business Essentials Preformatted hard drive is ready for immediate use with Windows or Mac