Are the HGST Nas 4tbs reliable or recommended? Saw in the hot deals section HGST Nas 4tb is on sale right now and $10 cheaper ($175)and 7200 rpm vs the WD red 4 tb ($185) which are only 5400 rpm. I been buying mostly Western Digital drives over the years and been using WD Blacks or Seagate SAS drives in my raids.