The Western Digital My DVR Expander 1TB Hard Drive is a black external drive with a 3.5-inch form factor, offering fast 7200 RPM rotation speed and a storage capacity of 1TB. It is compatible with PC and Mac systems, featuring a USB 3.0 interface for quick data transfer at a rate of 300 Mbps. This hard drive is part of the My Book product line by Western Digital and includes a USB port for added convenience. With a write speed of 16 times faster than traditional HDDs, this unit is a reliable choice for expanding storage capacity on your computer or other devices.