I was able to get it to format by 1st removing the original HD (left), insert the new harddisk (right), do a factory restore. Then it let me format my new harddisk (right), after that, I just put pack the old harddisk (left). The only problem is now my new drive become volume_1 and my old harddisk is volume_2. I have to adjust the P2P setting and remap the network drive. Everything seems to be normal now.