All data gone on My Book Studio II

At this point I would like to know if WD and Apple geniuses are working on ANY, ANY way of reversing what went wrong to bring the original volume back and yet they are still silent.

I never saw anything like this. It’s just a hard drive for god’s sake! It is unbelievable that the drive is erased without any warning! It is unbelievable that WD did not test their software on prerelease Mavericks! I still don’t see any warning on both WD and Apple web sites!