Just curious to know what happens at every stage when you run Test Disk.
Please have a look at the guide I had put out
here .
In the second window does your WD HDD show up with the correct capacity?
If you get as far as the fifth Window, what does the fifth Window show?
Try to complete the process and give your stage by stage comment.
Now if you had gotten upto the fifth Window, you can select
Backup. This should facilitate backing up whatever data is there on your HDD. Try and let us know what happens.
When it showed up an error message at some stage (at which stage ?) did you wait for a sufficient time? Did Test Disk say it cannot proceed further or you closed it even before Test Disk gave up?
You may appreciate none here could have tested Test Disk under actual troubled conditions and your feedback on it may help us.
Hope you will be able to recover the data on your HDD, even if it cannot be fixed.