Western Digital Red WD60EFRX 6TB NAS Internal Hard Drive for $209.52 shipped after promo code MPGAMER16 by checking out with MasterPass.  Here is a screenshot for your reference.  It features 3D Active Balance Plus, IntelliPower 64MB cache, SATA 6.0Gb/s interface, and NAS compatibility.  Most places have it for about $249.