This is a good one I swear For this specific issue, I have a USB3 harddrive dock collecting dust cause I could never get a reliable connection with my Lenovo Helix. Now that I have an SP3, I figure I try it again in the SP3 single USB3 connector. It seems to work! My test, (that failed before with the Helix), was transferring 20gigs of pictures from the SP3 SSD to the usb3 dock and it worked great for that. Also my other test of opening picture folders and letting the thumbnails get generated for large folders like 1000+ images at average 4-5megs each scrolling up and down really fast, passed with flying colours. It's everything I dreamed USB3 to be. HOWEVER. I plug the dock into the SP3 DOCK station usb3 port. The drive won't even come up. All I hear is the sound of a new device connecting... disconnecting, reconnecting.... disconnecting, reconnecting.... disconnecting and etc. What's even more fascinating is that I have a USB3 hub in my Dell U2413. I have that plugged into the SP3 DOCK. When I plug the harddrive dock into the monitor, it works great! I have a Satechi USB3 4 port hub as well. I plugged that into the dock, plugged the USB3 harddrive dock to the Satechi USB3 4 port hub and it works great. I don't understand what is wrong with the SP3 DOCK by itself.