In my case, Netgear actually recommended the beta code. It didn't help - I have yet another failure with it. I've noted my open case, so now it's in Negear's court. As far as I am concerned, they need to fix this (quickly), refund my purchase price for the NAS, or refund my purchase price for the disks. I have a unit I can't trust; to be honest I can barely use it at this point, and I bought the drives the Netgear themselves said were compatible. I have a copy of the old list in case they change it, which they probably should (at least make a note). This has been happening since August for me, and if we don't get to a resolution in a couple weeks, we're headed to small claims court. I hate to do that, but I don't think they have a clue how to fix the issue. I love the thing when it works, but it is useless to me at the moment and has been for quite some time.
Keep the good posts coming - it's nice to know I'm not alone in this