The Western Digital WD easystore 4TB USB 3.0 Portable External HDD in black is a versatile storage solution compatible with both PC and Mac computers. With a sleek 2.5-inch form factor and a durable design, this HDD offers reliable storage capacity of 4TB at a fast 5400RPM rotation speed. It features a USB 3.0 interface for easy connectivity and comes with a manufacturer warranty of 2 years. The WD easystore model also includes a 256MB cache and is powered by USB, making it a convenient and efficient choice for expanding storage capabilities on the go. "Sold as-is. Does not include connection cable or case