Unfortunately I had to return the product after two days, which meant I just managed to format and move my files, when write problems start to occur and the Western Digital disk check flagged too many errors to finish. Thanks to Amazon the return was no problem (money back within five days after posting).
I still give three stars, because maybe it was just one faulty drive under a million. But after reading lots of other review, I did not have the courage to try another one and instead bought a Hitachi. The Hitachi has at least pasted the 2 day mark.