Hi there retrop3,
Sorry that you are facing some issues with your WD drive.
One thing you can try is to attach the drive with different cables(both SATA and power ones) to a different port. You can check whether BIOS recognizes the HDD's size as mbarnes86 already suggested.
In case the issue persist, you can go to your MOBO's website and update all the drivers. Sometimes, issues like the one you are facing(HDD recognized by BIOS but nowhere else) could be driver related.
Let us know how this goes,
D_Know_WD