iStarUSA v7AGE420-ES 4-Bay Trayless eSATA Box External Hard Drive Enclosure - Black Screwless Design for Fast HDD Mounting and Swapping Two 60 mm Thermal Controlled Fans for Excellent Heat Dissipation Internal 120 Watt Power Supply Power Switch at Front For Use with All 3.5 SATA I/II HDD. This model does not have RAID functionality unless connected to a compatible e-SATA controller. V7AGE420-SAUF has built in RAID.