The s3520wu33er 2 bay raid enclosure with uasp enables you to build a secure external raid array with two 35rdquo sata hard drives connected to your computer through an available usb 30 or esata port for fast performance and efficient data transfers the enclosure supports sata iii transfer speeds up to 6 gbps when connected through esata the versatile raid enclosure can also be connected through usb 30 with support for uasp performing up to 70 faster than conventional usb 30