def METHOD_NAME(old_partitions):
    """
    Get new virtual disks in VM after disk plug.
    :param old_partitions: already existing partitions in VM
    :return: New disks/partitions in VM
    """
    session = None
    try:
        session = vm.wait_for_login()
        if platform.platform().count('ppc64'):
            time.sleep(10)
        added_partitions = utils_disk.get_added_parts(session, old_partitions)
        LOG.debug("Newly added partition(s) is: %s", added_partitions)
        return added_partitions
    except Exception as err:
        test.fail("Error happens when get new disk: %s" % str(err))
    finally:
        if session:
            session.close()