2U storage system

https://wiki-fusion.win/index.php/Lenovo_ThinkSystem_DE4200H:_A_Practical_Look_at_High-Density_DAS_Storage

A 2U storage system fits neatly into a standard server rack, offering two rack units of space for dense data storage. It's a practical choice for businesses needing to expand capacity without overhauling their existing infrastructure, balancing compact size with enough room for multiple drives.