Replacement WD20EZRX will not format

help ,

Product id: WD20EZRX-00DC0B0


I was sent a replacement hard drive as my old one would not work but i cannot format this new one. 
I have tried formatting it under Vista 3 times and it gets stuck after 54% complete.

I have also tried doing it Data Lifegauard but this stops after reaching sector 1999103.

can any one here help me ???

thanks daz .

test it for errors with WD diagnostics and check your event viewer for a message for when it failed the format.