Hi, i want to post some issue that i have had with the rMB. When i plugg an external Western Digital my passport 3 TB Hard Drive with the apple official usb-c to usb 3, and the hard drive works fine. But the problem is when i use the apple three-in-one dock (HDMI, USB-C and USB) adaptater, and i can´t work with the files that it has, the hard drive ends disconnecting after a while, every time i try to copy or move files. I tried another apple official three-in-one dock and i have had the same problem. Any of you have this problem too? Thanks, and sorry about my bad english!