After upgraded my computer to Windows 8.1 RTM, I plug my Seagate Backup Plus 4TB USB 3.0 external hard drive and it is not recognized. The Disk Management also doesn’t show it. Using other HDD and different USB port get the same problem. Then I run the Troubleshooter and it found “USB Root Hub Driver (xHCI) has a Problem. Reinstalling driver might fix.” Apply it but it doesn’t fix the issues.
The problem might be caused by the USB. I try connecting with the USB 2.0 printer and devices without any issues, but notice that many USB 3.0 controllers aren’t compatible with Windows 8.1 OS yet. So you can’t find it in File exploer after plugging in.
How to fix USB 3.0 External Hard Drive not recognized in Windows 8.1
* Make sure the drive isn’t faulty or broken.
* Disable the “fast-startup” feature in the Power settings
1. Press Windows + X from keyboard, and select Control Panel from the menu.
2. Go to Hardware and Sound > Power Options.
3. Click “Choose what the power buttons do” in the left-side panel.
4. Click Change settings that are currently unavailable
5. Scroll to the bottom, uncheck the Fast-Startup option, and click Save button.
6. Restart your tablet or PC.
* If the above tips are still not working, the simple way is to downgrade to Windows 8.0.