How old is the drive?
It may still be under warranty - I've had 2 drives replaced FoC by Seagate and WD.
Get the drive serial number, go to their website and see what your warranty status is.
They usually request some SMART test result, or their drive tools to be run - again, you can get these FoC as a download.
Has the drive been over temp? That's one area where they can be a bit sticky on replacement.
SD