From what I understand, the LDW-401 is designed in house by Lite-On.
The only reason they are using the Sony DRU-500A for the LDW-400D is because they made such a big deal about them having a DVD writer out by May.
To make a long story short, I really don't know if the LDW-400D works with KProbe or not.
"Blu-ray is just a bag of hurt." - Steve Jobs