I have a Mac Pro (Mid 2012) 3.2 Ghz Quad-Core Intel Xeon. A few years ago I bought some USB 3.0 ports to install in the back of my computer, but I’m not sure exactly what brand they are. I recently upgraded my OS to El Capitan from Yosemite, and noticed that the USB 3.0 ports are no longer working or recognizing any of my external hard drives. I’m assuming that this might have something to do with the drivers not being compatible with the El Capitan? When I check my “System Information”, under the USB category, I don’t think it is recognizing the 3.0 ports. Any recommendations on how to fix this problem?
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