Create Bootable USB (macOS)
Assuming that the disk is /dev/disk2:
# Erases the disk
diskutil eraseDisk FAT32 FloppyDisk /dev/disk2
# Unmounts the disk
diskutil unmountDisk /dev/disk2
# Copies files to the disk
sudo dd if=<path_to_iso> of=/dev/disk2 bs=4m && sync
# OR
# Copies files to the disk using pv utility
pv <path_to_iso> | sudo dd of=/dev/disk2 bs=4m && sync
# Ejects the disk
diskutil eject /dev/disk2