David H. Lipman wrote:

By default...
* If a drive is less than 32GB then it is formatted using FAT32.
* If the drive is greater than 32GB then it is formatted using using NTFS.

USB drives come pre-formatted using FAT32 for the widest compatibility
under different operating systems. Since FAT32 partitions can be up to
2 to 16 TiB in size (depending on sector size), pretty much all USB
drives, so far, will come with FAT32 partitioning by default. There are
a couple USB drives that come pre-formatted with NTFS but that is not
the norm.