Hi I recently purchased a airport extreme to take the place of my express. I have i 500GB WD My Passport that i use for backing up, movies and TV series. I decided to connect the HDD to my Airport to eliminate the need of manually connecting it to my Imac(intel) and MacBook Air worked fine until i decided i need to use it with my MacBook air via USB. It wont show up in devices only Disk Utility Airtport has seemed to change format from Mac OSX(journaled) to Fat and now it work even let me erase the HDD. Any suggestions? Cheers.