Complex sentence: Optional detachable SATA hard drives are used for the storage of games, music, downloaded trailers, levels, demos, player preferences, and community-created content from Xbox Live Marketplace; it may also be used to transfer such content between Xbox 360 units.
Split into simpler sentences: Optional detachable SATA hard drives are used for the storage of games, music, downloaded trailers, levels, demos, player preferences, and community-created content from Xbox Live Marketplace. It may also be used to transfer such content between Xbox 360 units.