For a steady link, the devices connected to the four Port Hub should not exceed a put together recent of 500mA at 5V. Exterior really hard drives must be linked to an external power source. This four Port hub will likely not charge your units, it'll only sync them. https://qvs-usb-3-1-gen-1-type-a63726.blogolize.com/the-2-minute-rule-for-sabrent-usb-3-0-4-port-hub-with-individual-power-switches-67866735