I also tried to change from MBR to GUID and vice-versa with no success. under OS X, I tried to initialize the physical drive several times with Apple's Disk Utility.Whenever I plug this device into a computer, there is a virtual CD unit that pops up called 'WD Unlocker', and I'm trying to remove it physically, instead of just hiding it (I found many guides on this, and by the way none of them worked). I have a WD My Book (3TB storage, USB 3), and just like many other enthusiast owners of this external drive, I'm trying to get rid of their crapware.
