The s3540bu33e 4 bay hdd enclosure lets you install four 35rdquo sata hard drives into an external enclosure and connect to your computer through usb 30 or esata for fast performance and efficient data transfers the enclosure supports sata iii transfer speeds up to 6 gbps when connected through esata the versatile enclosure can also be connected through usb 30 with support for uasp performing up to 70 faster than conventional usb 30 when paired