I posted on the same issue:
For now i solved using the “ultimate boot CD” which is a free boot cd iso on which you can find dlgdiag and various other diagnostic tools.
I also contacted the email wdc support but, after 45 days, they didn’t solved the issue and, onestly, i’m still not sure they have completely understood the problem…They have just said to me that they are mailing (postal mail) me a new CD to use! I suspect they are sending me exactly the same version i downloaded from the website…