I have 5 externals (4 8TB Segates and 1 8TB WD) running on an Anker USB 3.0 hub with no issues (This one: https://www.amazon.com/Anker-Aluminum-Portable-Adapter-Devices/dp/B00PBZX0OM/ref=sr_1_10?ie=UTF8&qid=1517008033&sr=8-10&keywords=anker+3.0+usb+hub). Of course, I have each one powered individually - I personally have never even tried powering an external off a hub...