I’m trying to copy a folder of photos from my MacBook Pro to My Book, when I try that, the “copy WD Internal Drive” option is not available. When I try to drag & drop (just to test if that is even possible), I get a "My Book can not be modified? message. Can any one help with this?

Can not drag and drop from MAC to My Book

AlCapone September 28, 2013, 7:26pm 8

Yes, I know but the description is difficult for a new Mac user to understand and work out what to do.