WD  My Book World Edition 2 TB Network Attached Storage Automatic and continuous backup for all the computers on your network Cutting-edge technologies to deliver high performance read and write speeds ideal for the most demanding users Built-in media server for streaming music, photos and movies to any DLNA certified multimedia device Centralize your music collection and stream to a Mac or Windows PC using iTunes software System Compatibility: Windows XP, Windows Vista, Windows 7Mac OS X Tiger, Leopard, Snow Leopard