Incompatibility with WD hard drives and the G5

We have reported to you several times about the apparent incompatibility between certain Western Digital hard drives and G5s (both PowerMacs and iMacs).
The hard drive manufacturer has published a note in regards to this in their FAQ.
They have learned that the affected models are 400 GB drives and the Raptor 150. The only solution they offer (which is not always possible) is to connect the drives to an additional SATA card.
The problem seems to be related to an incomplete implementation of the SATA standard in Apple's products.
We know, however, that the Raptor 150 works fine in a G5 Quad, which leads us to believe that Apple has solved this issue on these machines.