I consider buying the Samsung 840 pro SSD HD and use it as an external drive combined with a USB 3.0 connection to my late 2012 iMac. I see the the SSD drive is sata III and Sata I/II compatible, while the enclosure like the Zalman ZM-HE130 usb 3.0 are is only Sata I/II compatible. Will I loose data transfer speed, if I go ahead with this combo?