def METHOD_NAME():
    print("Usage:")
    print("all <HOST UUID> <SR UUID> [--master]")
    print("single <VDI UUID> [--force]")
    print()
    print("*WARNING!* calling with 'all' on an attached SR, or using " + \
            "--force may cause DATA CORRUPTION if the VDI is still " + \
            "attached somewhere. Always manually double-check that " + \
            "the VDI is not in use before running this script.")
    sys.exit(1)