Hi there. I've had a WD My Passport Ultra 1TB for about a year and ha half now, and so far nothing has gone wrong with it. The other day I plugged it into my 2012 MacBook Pro as I was using it downstairs to upload some photos to a website, and when I disconnected it from the Mac it stopped working. I then plugged it back into my main PC upstairs which is a Packard Bell Desktop, and Windows wanted to scan it for errors. So I let Windows scan it for errors, and then it came back to me saying it could not fix the problem. I try it in a Windows laptop, and it did the same thing there. The weird thing is though, is that I can browse the disk for a few minutes, but as soon as I start to copy or paste anything to or from it, it then disconnects itself and I can no longer access it. I have used the WD SmartWare program to look for errors, but the 2 scans I did brought up no errors. What's wrong with it?