Problems with WD400KD and G5

A reader of XLR8Yourmac has reported a problem while trying to install a Western digital WD400KD 400GB SATA HD into his PMG5 dual 1.8GHz
It seems that there is a compatibility issue between this drive and his PMG5, because on most of the test we have performed with large capacity HDs, such as Hitachi 400 and 500GB, we never had any problems.
The QuickBench tests that he as provided do not bring much information regarding the problem with his HDs, since he has only run a small size file test. One will need to repeat the test with a 20MB file to make it informative.