If that's the case (and I don't know much about raid) then since we now have a solution for the 4k sector issue then I don't see why there isn't an easy firmware update for it. Certainly the method I posted for formatting the 4k sectors on boundaries properly is extremely easy to put into the firmware - it a matter of changing 3 lines tops (Using Fdisk -H 224 -S 56 to partition instead of whatever other Fdisk command they have insures it's on 4k boundaries).
The more I look into this and understand it, the more I come to the opinion that Dlink have a really poor firmware development lab. For the past 2 years on the DIR-655 we have had one firmware debacle after another. I have a suspicion that they outsource firmware development and don't understand their own firmware. I mean, I didn't have a clue how the thing worked apart from it was a box with 2 drives in it and some flashing blue lights, and within 8 hours I was able to update my machine to get over the 4k sector problem.
Just looking through some of the code, if people like Wilson Chan have moved on then I suppose it wouldn't be the easiest job in the world to go back in and edit it

But I suspect with even my limited knowledge that after updating fdisk bin and commands it probably a matter of a kernel update? I dunno.
Time we had some more info from Dlink though!