See the thread in the DNS-325 Disk compatibility forums, I asked this same question there.
These Western Digital RED drives are going to be very popular, due to price and due to their firmware being tweaked for NAS and RAID.
I don't understand why D-Link wouldn't test their NAS boxes for compatibility with these new drives!
Now I am saving up for a DROBO, which is compatible with the WD REDs.
Good Luck.
D-Link advised:
Based on the cross compatibility between all of the products you mentioned, I would presume there is a high likelihood of compatibility, although you'll have to either test this for yourself or look for other DNS-325 owners who tested these HDDs. Unfortunately, D-Link does not take HDD compatibility requests. Aside from the periodic compatibility lists D-Link publishes, this forum is the next best source for such information based on DNS-325 owner contributions.