def create_data_disk(vm_=None, linode_id=None, data_size=None):
    r'''
    Create a data disk for the linode (type is hardcoded to ext4 at the moment)

    .. versionadded:: 2016.3.0

    vm\_
        The VM profile to create the data disk for.

    linode_id
        The ID of the Linode to create the data disk for.

    data_size
        The size of the disk, in MB.

    '''
    kwargs = {}

    kwargs.update({'LinodeID': linode_id,
                   'Label': vm_['name']+"_data",
                   'Type': 'ext4',
                   'Size': data_size
                  })

    result = _query('linode', 'disk.create', args=kwargs)
    return _clean_data(result)