Hi,
just to let you know, I've been using a single HITACHI 2TB H3D20003254S for probably just less than a year now and have had a few problems. It once seemed to become corrupt and required reformatting loosing everything I had on there, a few weeks ago it seemed to loose all of the UPNP library so that needed to be recreated by the NAS and has just seemingly stopped working completely with the NAS - it needed the UPNP library to be recreated again but froze on 0% and now the NAS won't recognise the drive. I will try it in my PC at some point to see if it can still be used as it seems a waste otherwise.
I'm not sure what would make a drive 'incompatible' so maybe someone can confirm whether these are the effects of an incompatible drive, a faulty drive or the NAS misbehaving. So long as its not the NAS misbehaving I was going to try to replace it with a drive on the official list, the only problem is that it seems like quite an old list and the drives available at places like ebuyer/dabs aren't the exact models you have listed, after a bit of googling I've only found a couple of drives that are available and those are refurbished on ebay. As the enclosure is still selling is there any intention to update the official list in the future?
Thanks.