Cavalry Storage CADA-SA4 Series 4 TB eSATA 4-bay RAID Personal Disk Array CADA004SA4 - Includes eSATA Kit eSATA interface (transfer rate of 3.0 Gbps) Configurable to RAID 0, 0+1, 1, 5 and RAID 5+hot spare (pre-configured to RAID 5) Tray-free hot swappable design Unit Includes - One (1) year manufacturer's warranty, four (4) 1 TB 3.5-inch hard drives installed in quad bay enclosure with built-in fan, eSATA cable, eSATA RAID controller (PCI-Express card), AC adapter, Resources CD and Quick Start Guide System Requirements - Available PCI-Express slot, Mac OS 9.x or newer, Windows 98SE / Me / 2000 / XP / Vista