I installed a Z turbo drive on my new HP Z440 as a data drive. After installation my WD My book external USB 3.0 hard drives either disapeared or would not read/write. I uninstalled the external hard drives, then reinstalled and have the same problem.
I removed the Z Turbo drive and the external hard drives are working normally again.
There is obviously a coflict somewhere. How do I resovle?