Hubs and power. My Superbpag 3.0 (14 amp) is great if it's plugged into a usb 2.0 port. But there's only room for four Du-1s. My new Anker 3.0 (10 amps) runs all five for a while in 2.0 or 3.0 ports and then crashes with a write failure. I suspect a driver problem there. You need full power to both plugs of the Du-1.Would love to know why I have to babysit these things. Every time I turn around I have one of them either barely hashing or showing me 90GH/S.....which means it's fubar. :/