I just got the 4tb Mycloud mirror and have set it up on my network.
I currently have another WD Mybook connected to the Mycloud mirror via the USB port on the back of the mirror.
I am copying across a movies folder (182GB) and the transfer rate seems super slow! Both devices are USB 3 capable, my iMac has a USB 3 port as well (although no devices are connected to it).
what i did was open the mycloud mirror on the iMac via the finder and dragged/dropped the folder across. It is saying around a 6 hour timeframe which seems crazy long with 2 USB 3 devices!
Is there anyway to speed up the transfer? I was going to do it over the network with a ethernet cable but that would be even slower.