OK, I had a WD My Book for Mac and since I could not do much wrong eingentlich. Also running, prima formatted fast enough .... But now there is still a problem: The drive does not turn on or off, if it is to make a Time Machine backup, so every hour (for which I took advantage of them), but constantly !: when I want to save something if I Users Change servicekit on Mac or Mac to use some pause is active again. And that takes a few seconds each time. It's frustrating. I have enabled in the auto shutdown 10 min. I used it on a new Mac with Fusion Drive. This refreshing speed advantage seems now diminished. In the old WD that was not so. Too Bad. Otherwise it is ok.