Ok so I have a WD external passport that will no longer appear on my Macbook pro. I tried to run a firmware update on the HDD that didn't finish. Since then it will not even show in disk utility. It will connect to my iMac just fine. I also have a WD 2 TB Hard drive that runs time machine on my iMac that will not mount to my Macbook. Could I have done something to my Macbook that would make it stop recognizing HDD all together?