I use my sony hard disk since one year .it’s USB 3, external hard disk, black colour is looking good, copy speed in USB 3 port is around 70mbps so it is good. sony provide good service facility, if we have problem u can solve it at sony service center by just showing original bill of product .hard disk’s thickness is 2.5 inch so it is slim to avoid damage I suggest to keep it in cover .i also purchased sony 1TB hard disk on 4250 Rs