Two Passports

I am connecting two separate external PASSPORT WD Hard Drives to the computer, but it only recognizes one of them. I’ve tried a number of swaps and restarts and reconnections, but it will only recognize one hard drive at a time.  If I unplug one, it will recognize the other and so forth.  Any Clues?

It’s a Windows problem, signature collision. This post explains what to do


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