Hello to all, now here we talk about the external hard disk the Dell 1tb Usb3.0 Portable external hard is easy to use easy to maintain and not demanding. I bought it 4 years ago and it works smoothly till now, you can use it to store your computer data, move your from one computer to another computer . Overall all it is one of the best external hardisk and gives satisfactory to the user . The size is approx 2.5 inch and you can take it with you every where because it gets space on your pocket .so I recommend you to buy it .the price is in range and too affordable to buy by medium users