WD My Book 4TB External Hard Drive (Black) – WDBFJK0040HBK@9977
http://www.infibeam.com/Computers_Accessories/wd-my-book-4tb-wdbfjk0040hbk/P-coac-32130360721-cat-z.html#variantId=P-coac-806797605

amazon price:-10649
http://www.amazon.in/WD-Desktop-Storage-External-USB3-0/dp/B00FAD8KEK/ref=sr_1_fkmr0_1?ie=UTF8&qid=1464669701&sr=8-1-fkmr0&keywords=WD+My+Book+4TB+External+Hard+Drive+%28Black%29