Why is the hard drive an optional component for the Xbox 360 Core System?
We want to expand the Xbox experience to different audiences. By offering choice to consumers we allow consumers the flexibility to enter the immersive, high definition world of Xbox 360 gaming and build toward the complete Xbox 360 entertainment experience. Xbox 360 Hard Drive is a 20-gigabyte detachable hard drive that allows gamers to easily transport their saved games, downloadable content including music, downloaded trailers, levels demos and community created content from Xbox Live Marketplace. In addition, Xbox 360 is built for the future and can evolve to expand into new multimedia entertainment scenarios.