The s252smtb3 2 bay thunderbolt enclosure enables you to connect two 25 sata iiiiii hard drives hdd or solid state drives ssd to your macreg or pc using an available thunderbolt port faster transfer speeds transfer data to and from your external drives faster than ever before through a thunderbolt connection with data transfer speeds up to 10 gbps thunderbolt performs 100 faster than usb 30 5 gbps and 60 faster than esata 6gbps the unprecedented performance thunderbol