I am having trouble with a Western Digital Sentinel DX4000 NAS. It runs in a RAID10 configuration and I am aware that there need to be a minimum of 4 disks in the array but does anyone know if WD requires them to be WD drives or can I use Seagate for example? Also, do they all have to be the same capacity? As it stands right now I have two 3TB and two 2TB rives in there and it gives me an error message while trying to reconfigure the software "Invalid Config." Just hoping someone has some experience with a Sentinel NAS. In desperate need of assistance!! thanks!