What is the specification of the external USB flash drive to the Mi Box S?

The Mi Box S supports an external USB flash drive with a capacity of up to 512G and FAT32.
FAT32 (File Allocation Table) is a file system used for smaller storage devices, primarily USB flash drives and SD cards. It is compatible with Mac and PC, as well as many other media devices such as cameras, smart TVs, and gaming systems, making it the most universally compatible file system.