I have the same issue with my new SanDisk Ultra 32GB USB 3.0.
This machine boots both Windows 7 and Windows 8.1, the drive reads fine in Windows 7, reboot into 8.1 and it sows up in Device Manager as “Unknown USB Device (Invalid Device Descriptor)” and reports an error code 43 to the same effect.
I was hoping by now somebody had solved this.
