Diskutil
Diskutil – tool for working with disks and partitions on macOS. Includes options not available in Disk Utility GUI.
# List disks and partitions
diskutil list
# List file systems which can be used for formatting
diskutil listFilesystems
# Erase existing disk
diskutil eraseDisk <filesystem> <new_disk_name> <disk_path>
# Unmount entire disk
diskutil unmountDisk <disk_path>