'Return ``True`` if you can expect multiple chunks.
NB: If a particular file representation is in memory, subclasses should
always return ``False`` -- there\'s no good reason to read from memory in
chunks.'

def multiple_chunks(self, chunk_size=None):

    if (not chunk_size):
        chunk_size = self.DEFAULT_CHUNK_SIZE
    return (self.size > chunk_size)
