The Seagate FreeAgent Pro Desktop 500GB External Hard Drive (M Series 9NL6AR-500) is a black external drive that is compatible with both PC and Mac systems. It features a USB 3.0 specification and a rotation speed of 7200 RPM, making it a high-performance storage solution. With a storage capacity of 500GB, this external drive is compact in design and easy to use, thanks to its USB port and compatibility with both eSATA and USB interfaces. The Seagate FreeAgent Pro is a reliable choice for those in need of additional storage space for their computing needs.