So I picked up a 750GB WD My Passport at BB a couple days ago, oblivious to the added Drive Lock/Smart BU crap on the label - I was going to format it anyway. After formatting for Mac OS Extended, I ...

How do you mean? Should you be able to unplug the old drive from the computer and plug in the new one? Of course. If you intend to open up the cases and switch the drives between the two external ...