You wrote " I can confirm that the WD30EZRX installed without a hitch, rebooted the TimeCapsule and all I had to do was erase the disk to see the whole 3TB space (it reported 2.7TB in AirPort utility, but When I restarted TimeMachine it reported 3TB free). yes! I did have to remove the old backup drive and restart a whole new backup from scratch - but maybe that's not a bad thing?"
I bought and installed this drive. Can you also tell me how you removed the old backup drive? Thank you for your help!