I can't answer for sure why some software says pass while others say fail. What I can say is someone has to have thought about what they are going to test for and then how to test it. Maybe the manufacture has more insight about their product and how best to test it.
My advice as others have said is this drive is failing and I would recommend its replacement.
Windows Easy Transfer is a good way of backing up not only your data but windows settings such as email etc, making it quite easy after reloading the operating system to import them back.
