Hi there ezpzlem0nsqz,
I believe you will need to provide some more information on the issue you are facing, so other users have a clearer picture on what is going on.
Is this a secondary or a primary drive? (OS one)
Can you provide a screenshot of Disk Management? Just upload the pic to an image hosting website and post the link.
You are aware that you need to back up the data stored on the drive before formatting right?
Let us know how this goes,
D_Know_WD