I have a Buffalo NAS, with 1 terrabyte of storage. Two disc in Raid 1 configuration. I'm trying to upgrade the storage to 4 terrabytes. Got the new drives, and swapped 1 drive out, NAS saw the drive as 4 terrabytes, and formatted to same. I understand that the raid would not rebuild with unequal drives. I tried to install the 2 4 terrabyte drives and initialize the NAS. No joy. I've tried to reinstall the 1 terrabyte drives, and again, no joy. I have no idea why this is happening. The NAS will not boot and recognize usable space on any drives. When it boots with the 1 terrabyte drive installed, I cannot log into the web based utility to configure the NAS. Using the Buffalo Utility, the NAS comes up in "EM Mode", which is emergency mode. The documentation says to upgrade the firmware if that happens, but the NAS won't allow me to do that. I don't know if there is a "hard reset" button, but I don't think so. What am I missing?