Up to 5TB that can hold up to 125 games, so that you can save old favorites and still have room for new titles. (As used for storage capacity, one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. Number of games based on a 36GB average per game. The number of games will vary based on file size, capacity, formatting, other programs, and factors.) | 1-Month Xbox Game Pass Ultimate membership included with purchase (1-Month trial offer of Xbox Game Pass Ultimate for New Xbox Game Pass members only. Limit: 1 per person/account. Available for a limited time. See product packaging for full details.) | Works with Xbox Series X/S (store and play Xbox One games, archive Xbox Series X and Xbox series S games.) | Portable form factor that provides fast access to your gaming library, anywhere you go. | High-performance HDD in speeds up to 130MB/s to optimize your console or PC gaming experience. (Based on read speed and internal testing. As used for transfer rate, megabyte per second (MB/s) = one million bytes per second. Performance will vary depending on your hardware and software components and configurations.)