Why only 4? Now I have connected to my notebook a 3.5 and a 2.5-inch hard drive. In this combination was pulled too much Storm. Not that there were problems with the USB. No LAN was always turned off and then on again. If I attached any 2.5-inch external but only the 3.5 inch did not occur the problem.
Hence my request Inateck ... bring the unit with external power supply on the market.