Store your photos, videos, movies, and other files with an external hard drive. You can use an external HDD for your computer, laptop, or gaming console. A 2.5-inch hard drive uses 1 cable for power and transferring files. Because of this, you can use these hard drives when you're on the go to your work, for example. A 3.5-inch hard drive needs a separate power cord. Do you edit large, unedited video files? Choose an external HDD with 4TB or more.