I have had a plethora of the WD MyBooks fail in the last 3-4 months!? In all cases, the computer seems to recognize it has been plugged-in, but will not display a drive letter, no matter what computer we plug them into. Two of these was the cause of critical loss of data by the end-user. There seems to be no chatter about this in the forums for a fix or a reason as to why. Anyone have something to add here?