My WD 2TB External Drive can't be formatted.

Hi there,
Something really mysterious happened last night and it has completely stumped me.
I have a WD 2TB External Drive that I use with my iMac and Macbook Pro, it's formatted FAT so that I can use it on Windows aswell. This setup has worked well until last night. I plugged the external into a Win PC and it didn't want to pick up. It showed the drive letter and drive but not the usual name. It gave it the generic windows name and when I clicked on the icon nothing happens. When I ran disk management on Win it shows the drive is healthy but that it has 2TB free space which is obviously not true since it had 1TB free space.
I decided to safely remove it and plugged it into my macbook pro. It then also didn't pick up and only showed up in Disk Utility with the partion grey'd out. I tried for a couple of hours to verify the disk and repair the disk in Disk Utility and it would run and complete both but then when I tried to mount it in Disk Utlity it would say it can't.
I then thought the drive is fried so I downloaded Drive Drill to see if I could access the content on it to restore my lost data. I ran it and it picked up the drive and restored 100% of my lost information. I then tried to format the drive but everytime I delete the partition and format it it gets stuck on a certain position and won't do anything for hours.
I know the drive works fine because initially I left it and it eventually formatted the drive and it picked up on the dock. I then tried to copy information over to it and after 100GB it got stuck and wouldn't do a thing. I then decided to format again because I suspected some files that were corrupt might have been transferred over again when restoring the data on it.
Now my problem is that it shows up in Disk Utility and I can run verify and recovery but as soon as I want to format it doesn't work and it stays stuck at the point of formatting the drive.
I have already tried the following:
- A different USB plug
- Formatting in Windows
- Different Formats (ex-FAT, NTFS etc)
- Completely removing the partition and creating a new one
Here are screen shots of what it says when I verify and recover the drive:

Thanks for the feedback Linc,
I have tried to repartition it and I also tried to delete and format, all of it takes time and finishes the process but then when I tried to mount it says it can't mount the drive and neither does it pick up on Windows. Very confused!

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