Why is this happening?:
With Intel eXtensible Host Controller driver 2.5.3.34:
-USB 3.0 hard drives take 70+ seconds to appear as Hard Drives in Windows Explorer when plugged into USB 2.0 ports.
With unreleased Intel eXtensible Host Controller driver 3.0.1.41:
-The delay is fixed - USB 3.0 hard drives now show up quickly when plugged into USB 2.0 ports
-USB 3.0 hard drives never show up as Hard Drives in Windows Explorer when plugged into one of the USB 2.0 ports. They do with the other USB 2.0 ports and USB 3.0 port.
-Industrial PC with
-Windows 7 x64, x86
-Intel Core i3-4010U Haswell SOC
-Intel 8/C220 Series Chipset Platform Controller Hub
-3x USB 2.0 ports, 1x USB 3.0 port
-XHCI set to Smart Auto in BIOS
-Testing with Seagate and Toshiba external USB 3.0 non-powered hard drives