def get_guest_discard_disk(session):
    """
    Get disk without partitions in guest.

    :param session: Guest session
    :return: Guest disk name
    """
    list_disk_cmd = "ls /dev/[shv]d*|sed 's/[0-9]//p'|uniq -u"
    disk = session.cmd_output(list_disk_cmd).splitlines()[0]
    return disk