zero fill through gparted resulted in increase in bad sectors, initiated RMA on 10 feb, pickup date is 16 feb, lets see how it goes.
want to share my friends experience with wd RMA-
-he received 1tb green drive in return of 500gb green drive in one week(advance delivery)
-the new drive developed bad sectors in just 2 weeks,and system became unstable, then he created another RMA request.
-new drive was 1.5tb also in advance(don't know what edition), the packaging was intact but the hard drive was wet, and some white stuff(maybe the insulation) was coming out the back side, he rejected it, and after some heated arguments with the cc, now he is getting 2tb blue drive.
so guys, open your replaced drive, if you are getting it in advance before accepting it.