My 2 TB My Book World (white lights) completely failed after only 9 months. I checked the warranty online which told me it ran out in June 2013. I received my replacement so I checked the warranty online to find that:
a) the serial number reports the unit not as a NAS but an external 2 TB dive!
b) The warranty runs out in December 2012, less than the old NAS and not March 2014 as I would expect.
I have emailed WD but I have yet to receive a meaningful reply - just auto responses so far.
I’m sure that as the NAS was only 9 months old it should be replaced with a new one with a full three year warranty.