After using the boot disk creation tool that comes with the Ubuntu system, the space displayed by the U disk to the Windows system is different from the size of the U disk.
Solution to this problem:
Using the Linux terminal:
The first step: sudo fdisk -l This command is mainly to view the details of the disk partition, and at the same time determine the U disk partition, here it is assumed that the U disk to be formatted is /dev/sde
The second step: sudo umount /dev/sde this The command is mainly to uninstall the U disk partition (need to be uninstalled and then formatted)
Step 3: sudo mkfs.vfat /dev/sdb -I to format, the formatted format is FAT
Step 4: Format to ntfs and ext4
Let's talk about ntfs first: sudo mkfs.ntfs /dev/sde
and then ext4 (this is the format under Linux system): sudo mkfs.ext4 /dev/sdb, and also sudo mkfs.ext3 /dev/sdb and sudo mkfs.ext2 /dev/sdb