The Xbox One system software, sometimes called the Xbox OS, later on OneCore, is the operating system for the eighth-generation home video game console, Xbox One. It is a Windows-based operating system using the Hyper-V virtual machine monitor and contains separate operating systems for games and applications that can run on the console. It is located on the internal HDD for day-to-day usage, while also being duplicated on the internal NAND storage of the console for recovery purposes and factory reset functionality.