RMA replacement drive warrnanty

I got my repalce Caviar Black WD1002FAEX drive instaled.  I then went to register the drive only to find 110 days of warranty, compared to 1622 for the “original” drive.  I have seen other posts stating the warrnty period will be updated when WD tests the returned drive. 

I sent it under the standard RMA and not the advanced RMA.

What will happen? 

Contact WD, they will update the warranty for you.

To Contact WD for Technical Support

They are of no help!   They just state “wait” for the warranty period to “change.”  

How can a Caviar Black with a manufacture date of December 25, 2010 only have a warranty period @ 100 days?