What is the normal warranty from WD and is there extended warranties either by WD or 3rd party
Check the following links to see the warranty time for the different WD products.
Worldwide Warranty Policy and Limitations
http://support.wd.com/warranty/policy.asp?&lang=en#americas
Extended Warranty
http://support.wd.com/warranty/policy.asp?&lang=en#extwarranty