I disassembled the drives and they are not the same series or made the same year.
It is time that Western Digital is aware of these problems.
2 * because it is a very good product ... when he walks.
PS I read that a columnist has made a record that "tic tic". He can try the trick of putting the disc into a freezer (look for the complete recipe on the net): sometimes it can "resurrect" the disc time to retrieve the data but after the disc makes the soul permanently (it sounds like an episode of Dr. House lol)