Xbox 360 Hard Drive Slim 20GB HDD HardDrive Hard Disk (Backwards Compatible With Xbox 1 Games) 20GB HDD Hard Drive Disk for Microsoft Xbox 360 Slim is the best option for media enthusiasts who game on Xbox 360 Save your game progress, Xbox Live gamer profile, game demos, and custom soundtracks from your own music collection Because the drive stores some system files, the available space would be about 228gb Backwards Compatible With Xbox 1 Games