The readers storage drives and hubs leverage usb 30 technology for high speed performance while the professional workflow hr2 hub is also designed to deliver next generation thunderbolt 2 speeds thunderbolt 2 technology gives photographers and videographers the power to quickly transfer 4k video and other large media files at up to twice the speed of thunderbolt and up to 4x the speed of usb 30 devices the professional workflow hr2 hub is also backwards compatible with thunderbolt and usb 2