Just ordered this
HGST Deskstar 3.5" 4TB CoolSpin SATA 6Gb/s US $119.99 - $30.99 (coupon code 3381244) = $89.00 + sale Tax for use with my Seagate GoFLEX Home unit. The coupon will expire by 9/5/16 (Labor day). If you had Fry's Electronics store nearby, grab it while they still have it.