Can't get 2 x WD Passport 2T to work simultaneously

I have 2 WD Passport 2T drives that I want to run simultaneously on my laptop (Windows 7).  When each is plugged in individually, they work fine but my laptop will only recognise one of them when both are connected.  Any advise or help to enable both to be recognised and used simultaneously would be appreciated.

It’s a Windows issue check this thread for the solution Joe

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Thanks so much. The information in the post you linked me to was spot on. Problem solved. Your help is very much appreciated! :smileyvery-happy: