create ext4 usb code example

Example 1: linux format usb command line

df -h 
Select the correct drive
sudo umount /dev/sdc1
This command formats the drive as FAT32, you can use other formats too
sudo mkfs.vfat /dev/sdc1

Example 2: linux quick format usb drive

umount
fdisk -l to get the dev/sxxx
For the vFAT (FAT32) file system: sudo mkfs.vfat /dev/sdc1