This 640GB USB 3.0 external hard drive in black is perfect for backups and extra storage on devices like iPhones, laptops, PCs, iOS, Macs, and Android devices. With a sleek white design and a 2.5-inch form factor, this external drive offers a rotation speed of 5400 RPM and a cache size of 8MB. It is powered by USB and features a shock-resistant design with an indication light for easy monitoring. Backed by 8MB of cache, this HDD external drive is an ideal solution for storing large amounts of data securely.