Hello I have a Macbook running Mountain Lion 10.8.3. I just bought a WD My Passport for Mac and have put everything I need to on it. Whenever I try to play a movie from my external hard drive my mac freezes. Sometimes I can still watch the movie but the beach ball is there. Other times the picture has frozen but I hear audio and most times everything just freezes and I have to wait at least 10 minutes for force quit to pop up, and sometimes I just have to shut the power off manually. It's quite frustrating. I did a disk utility check for my mac AND for my external hard drive and everything seemed to be fine. Also there have been a few times where the screen has gone black when I've tried playing media on my external hard drive. It seems to happen it I move the screen (or that's just my mind) it hasn't happened in a while though. Any help or suggestions on what to do about the freezing would be much appreciated. Thanks!