Answer ：FAT32 and exFAT format U disks require a small amount of space to store some information on the U disk itself. Of course, the occupied space has a certain range. If it exceeds this range, be careful about whether there is a virus, and you can perform anti-virus formatting. The standards are as follows; 2GB or less: FAT format, occupying space 0 bytes 4GB-32GB: ie FAT32 format, occupying space 4KB-32KB 64GB and above: ExFAT format, 384KB and above (no more than 1MB)