Double click and you'll be asked to format it. You will see an unformatted partition as large as the drive capacity. Exit the utility and open This PC or My Computer.Type create partition primary to create a single partition as large as the capacity.Type clean to erase the entire drive including the partition table.Type select disk 1 (I'm assuming the WD drive is disk 1).Identify the WD drive by it's storage (it would be around 1000 GB or whatever the capacity is). You can identify all the disks by their storage size. The first listed disk (disk 0) is often the computer's hard drive.
I don't know what exactly happened while you were formatting it for Mac (which caused them to be hidden) but you can recover all the space in a few seconds. There might be some hidden partitions on the drive.
