SanDisk Extreme 3.0 64GB only works in 2.0

USB Flash Drives All USB Flash Drives
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The link your have provided suggests to check the ports on my PC.

And on the Extreme.

Maybe your “USB 3.0 CF Card Reader that works just fine on all my ports” is conflicting with your Extreme 3.0.

Let us know if you find a solution to the problem.