Add four 3.5" SATA III hard drives to your Mac or PC through Thunderbolt, & build an external RAID array for accelerated performance or secure data redundancy. The S354SMTB2R Thunderbolt 4-bay hard drive RAID enclosure utilizes the unprecedented performance of Thunderbolt 2, enabling you to build an external hard drive array with your own choice of hardware RAID configuration. Thunderbolt 2 dramatically redefines external storage possibilities by smashing all performance limitations. Giving you 20 Gb/s of throughput, you can transfer data to & from your external drives faster than ever before. This unprecedented performance makes Thunderbolt 2 the only external solution for high-resource intensive storage applications including high-resolution video editing & photography on your Mac & Mac Book Pro. The S354SMTB2R supports hardware RAID enabling you to further increase your performance, & protect your valuable data at the same time, with support for RAID modes: JBOD / 0 / 1 / 1+0. The included software lets you monitor your array as well as set your hardware RAID configuration. Hardware RAID increases your performance as data is off loaded to the enclosure freeing up system resources for more process intensive/important tasks like file rendering (3D/ Video). In addition, using a 2.5in to 3.5in SSD adapter, enables you to add a single SSD to your array & utilize Hyper Duo, allowing for near-SSD performance at HDD capacities. To ensure peak performance from your external storage, the Thunderbolt 2 enclosure maintains an ideal operating environment for your drives. The enclosure features a built-in fan for enhanced air circulation & an aluminum housing that maximizes heat dissipation while providing rugged durability. Plus, with a sleek metallic finish, the enclosure will look great next to your Mac or Mac Book Pro. Get the most out of your Thunderbolt & Thunderbolt 2 devices by leveraging the Thunderbolt daisy chain port. You can connect up to