Initially, 250 GB hard drives were only available through third-party manufacturers or through the purchase of a special-edition Xbox 360 console bundle, but from 2010, it was being sold as a separate accessory in Japan, North America, and the UK. Currently, the 320 GB hard drive is only available as part of either limited/special edition Xbox 360 S bundles or as a separate purchase for Xbox 360 S consoles; it is not available for original Xbox 360 models. Of the total storage capacity, approximately 6 GB is reserved for system use; around 4 GB of that portion is reserved for game title caching and other hard drive-specific elements in games that support the hard drive and an additional 2 GB is reserved for use by the Xbox 360 backwards-compatibility software. This leaves users with approximately 14, 54, 114, 244, or 314 GB (displayed as 14, 52, 107, 228, or 292 GiB) of free space on the drive. Depending on the market, the hard drive comes preloaded with content, such as videos and Xbox Live Arcade games or demos.