Mediasonic ProRaid HFR2-SU3S2 4 Bay 3.5&rdquo; SATA Hard Drive Enclosure &ndash; USB 3.0 & eSATA &ndash; Certified Refurbished This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a 180-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished product on Amazon.com. The product may be packed in white box or original color box in like-new condition. Support 3.5" SATA I / II / III hard disk drive up to 12TB per drive, Support Hard Drive Transfer Rate up to SATA III Speed. Hardware Raid controller is built-in on board with one-button control. One Button Raid Control support Single Drive Mode, Raid 0 (Spanning) JBOD, Raid 0 (Stripping), Raid 1 (Mirroring), Raid 3 (Stripped set with dedicated parity), Raid 5 (Stripped set with distributed parity), Raid 10 (Mirroring + Striping) Smart Fan with built-in temperature sensor, Auto & Manual modes, and 3 speed levels. Support S.M.A.R.T., and Power Off in Synchronization with Computer (Does not support Auto Power-On)