Samsung 840 Pro 256GB SSD Seagate Constellation CS ST3000NC0 RPM 64MB. I have all the latest BIOS, updates, drivers and etc. If anyone has any ideas I am willing to try anything I have not already tried. All devices work correctly when plugged into USB 2 ports.įrom what I can tell, the entire USB 3 environment is a problematic P.O.S. It is clearly an unstable USB 3 stack and I am not sure who is responsible although I suspect Intel chipset drivers. I have tried so many trial and error methods to solve the problem and I have run out of ideas. I have contacted Asus, Gigabyte Intel, AFT, Anker Syba, etc. and they are all finger pointing. I have all the latest BIOS, drivers, firmware, devices, - anything that is involved with the USB 3 stack. I have updated to the latest Intel chipset drivers 9. I have tried BIOS setting for xHCI Mode - Auto, Smart Auto, On, Disabled. I have tried BIOS settings for Legacy USB devices on and off and the issues remain. I have uninstalled the Asus AI Suite 3 software and the issues remain. I have disabled power options for each and every USB device in Windows Device Manager. I have disabled Windows Power Options, USB Selective Suspend. To troubleshoot I have tried many things: One of the hubs I bought specifically because it has the latest chip and firmware: Anker® USB 3.0 9-Port Hub + 5V 2.1A Smart Charging Port with 12V 5A Power Adapter This hub FAILs to enumerate some external 
USB 3 ports for the devices and many more. I have tried many trial and error methods to solve this, uninstalling and reinstalling USB motherboard drivers, different cables to the AFT PRO-57U device different The Windows Device Manager shows the devices appearing and disappearing as enumerated devices. This happens consistently and the cycle time to disappear/reappear varies from 10 seconds to 10 minutes.
Then the drives (the PRO-57U slots) disappear, then reappear, then disappear, and reappear and so on. On two different motherboard systems I have had the same experience with 64 bit Windows 8 Pro and Windows 8.1 Pro compatibility with various USB 3.0 devices and hubs including:Īn AFT PRO-57U front panel card-reader/hub, various Anker, Syba multiport hubs, and these are just a few I have tried, there are many more.įor example: the AFT PRO-57U slots are enumerated correctly as drive letters in Windows 8.1. I was hoping the upgrade to Windows 8.1 would improve the stability but no. The USB 3 stack is unstable in Windows 8.1 and Windows 8.
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