I just bought my new rmbp 15' late 2013. It is the first time I can use usb3 hub and usb3 devices. I had usb3 devices in the past but with my older mbp I used them with usb2 speeds. The problem is that I face some strange disconnects with my seagate external usb3 hard disk, that I never had with my older mbp, although I connected it in usb2 hub port. So, when I connect the external hard disk directly to rmbp, everything is fine. When I connect it through my new usb 3 hub, sometimes it does not connect at all, and other times it connects but after a few minutes disconnect. In the same new usb3 hub, I have connected other devices (usb flash disks, mouse infrared transmiters, etc) with no problem, everything worked fine with my rmbp. I also have an usb3 extension cable for use with usb3 hub, as I had a usb2 cable extension with my older usb2 hub. This usb3 hub, is powered directly with it's own power plug. Seagate has it's own power plug. So, is this a problem of the usb3 hub? I thought of power problem. But why other devices work? I also disconnected everything else from this usb3 hub. The external hard disk had the same problem. I want you to help me to find out where the problem is. With just two usb3 ports in rmbp, it is inevitable that a mac user will use usb3 hub. Is it a power problem? Is the usb3 hub faulty? Or it is a problematic usb3 handling by retina macbook pro and mavericks? Where is the problem?