The Best External Hard Drives of 2021 Reviewed.com 4/30/2021 Richard Baguley — Recommendations are independently chosen by Reviewed’s editors. Purchases you make through our links may earn us a commission. Investing in an external hard drive is the easiest way to add extra storage to your Windows PC or Mac to back up up your important files, adding extra capacity for games and media content, or creating a complete backup of everything on your computer. After a month of research and testing, we can tell you that the best external hard drive for most people is the Western Digital My Book (available at Western Digital), which is available in a wide range of capacities from 3 to 18 terabytes. During testing, we found that it was capable of rapid, reliable data transfers. As it ships with software that will automatically backup your important files whenever you plug it in, it’s a perfect addition to any home office.