# 查看磁盘列表
>>> diskutil list
# 格式化磁盘
>>> diskutil partitionDisk /dev/disk2 MBR FAT32 UNTITLED 0b
# 推出磁盘
>>> diskutil unmountDisk /dev/disk2
>>> sudo sh -c 'gunzip -c ~/Downloads/ubuntu-18.04.3-preinstalled-server-arm64+raspi3.img.xz | sudo dd of=/dev/disk2 bs=32m'