LionRAID 4TB, eSATA & USB 2.0 Hardware RAID, Model: LR4TUE Hardware RAID, supporting RAID 0, 1, 1+0, 3, 5, JBOD and hot spare disk. Over 200MB/ Sec read and 170MB/ Sec write performance. True hardware RAID design within the enclosure, no driver and no additional RAID controller needed. Multiple RAID selection, supporting up to four volumes. Supports SATA I (1.5 Gb/ Sec) and SATA II (3 Gb/ Sec) hard drives. Over 2TB per volume via eSATA and USB on OS that support 2TB and above. Supports the latest 1.5TB hard drives. Up to 6TB in total storage capacity. Supports SMART, NCQ, and OOB staggered spin-up capable drives. Online array roaming. Online RAID level / stripe size migration. Online RAID capacity expansion and RAID level migration simultaneously. Automatic insertion / removal detection and rebuild. Hard drive, fan and temperature failure detectors to ensure system stability. Web browser-based RAID management via Arc. Http Proxy through RS-232 port for Windows, Linux and FreeBSD environments. Standard Interface. No extra drivers required. Compact, stylish aluminum design. 2 YEAR WARRANTY