So apparently there are WD Red Pro drives out now which are suppose to be for home/small office use but the problem is they cost just as much as RE 4 drives... so I'm not sure what the difference with them or advantages are? I know that the RE 4 drives are enterprise NAS type drives so that's what I was going to get to put into the DS412+ I just ordered on Amazon.... now I'm wondering if the Red Pro has anything special I should consider?