Parameters
        ----------
        sid : int
            Asset identifier.

        Returns
        -------
        out : string
            Full path to the bcolz rootdir for the given sid.

def sidpath(self, sid):
        """
        Parameters
        ----------
        sid : int
            Asset identifier.

        Returns
        -------
        out : string
            Full path to the bcolz rootdir for the given sid.
        """
        sid_subdir = _sid_subdir_path(sid)
        return join(self._rootdir, sid_subdir)