Unfortunately, given how new this product is, all we have to go on is the compatibility list and the experience of end-users who tried different HDD models and posted on this board.
Dlink is asking for trouble by doing this, you do realize it that? Would you by a car if the manufacture built it from scratch and never tested its road worthiness and said "all we have to go on is the experience of the customers who buy our cars?" Most likely no one will buy it.
Anyhow I have two older style 1.5TB Seagate Barracuda 7200.11 and two WD Green 1.5TB, the info status shows the drives are all okay after restarting the system however the disk manager says the RAID 5 is degraded but won't tell me which drive it thinks is the problem so I don't know if if its the one the Seagates or WD Green drives. Anyhow its doing a rebuild which has been running since 9am EST today and its now 7:16pm and its only 80% of the way through. In a production environment it should never take this long.
One other interesting to point out is the drive light on the front display; if one the drives were blinking; if that's what it's supposed to do when a drive is degraded; I would know which one has failed. If this is not already a feature then it should also be added to the wishlist so that people know which drive they need to replace in the event one does actually fail.
Andrew