Thank you for your post.
Our Development and Testing departments are aware of this issue. This is covered in Knowledge Base Article #6771 at:
I have sent this information to our Documentation department for consideration in future documentation.
Thank You for Your answer.
unfortunately, when one is not an englishmen, one will never find that article. Further on, it doesn't tell us that there is no way to install WD when the disk is formatted in a different way.
Best would be to include a warning while installing (when a not supported formatting is detected) - or a paragraph in the install_manual.
This issue took me one day to resolve..