The original Xbox was the first Xbox console to include a built-in hard disk drive.
Microsoft's original Xbox launched in 2001 with an internal hard disk, a feature that distinguished it from many competing consoles of the period. The drive stored game saves and supported downloadable content, system data, and other console functions without requiring a separate memory card for ordinary saving.
The hard disk also helped Xbox Live deliver downloadable content and updates when the online service launched in 2002. This storage-centered design became a foundation for later Xbox systems, which increasingly relied on internal drives for digital games, installations, and updates.
The original Xbox's standard hard disk capacity was 8 GB, although usable space was lower because the operating system and system data occupied part of it. Later Xbox consoles offered much larger storage capacities, but they continued the basic idea established by the first machine.