I had 3 units of mybook HD.
1st unit, it doesn’t work well, got a replacement.
2nd unit, it doesn’t work well too, can’t get replacement due to our of warranty. It doesn’t work everytime, must use with pray & luck.
3rd unit, best among all, been replace 3 time, from 2TB mybook studio to 4TB mybook studio to 6TB mybook thurderbolt.
First, 2TB stop working without notice, lost 2TB of important with it.
Second 4TB act funny like the 2nd unit, it doesn’t work everytime I connect. Due to limited support, I got to drive 200 miles away to send for replacement.
Third 6TB, same like 4TB, it doesn’t work everytime, and always disconnect by itself. Now getting worst, below are the screen shot.