Thanks James,
I discovered that if I wait until initialization is complete, I can plug the drive in and it works perfectly. I also discovered that the WD Passport can be driven from the front USB ports.
I'm just going to plug it in after it's initialized.
BTW, I formatted this drive using Windows 7 running under Bootcamp on my Mac Pro. Formatting shouldn't have anything to do with the problem.
I'm learning my way around this device and I'd have to say that if you know what you are doing, it's a fantastic product. I just ordered a 4BSST squared to replace my older 4B which completes my Bryston chain... BP-25mm, BDA-1, BDP-1 and BCD-1.
I'm also waiting for my new Magnepan 1.7's to be built.