I just registered and I believe set up my passport on my Mac. When I try to move my itunes library to it I get the message unable to modify my passport. I ran the check for it being set up properly.

"unable to modify"

Trancer April 8, 2015, 3:50pm 5

Formatting the hard drive is not done by means of the WD Apps, but rather through the built-in Disk Utility app: