int segment_idx_wrap; ///< number after which the index wraps
int segment_idx_wrap_nb; ///< number of time the index has wraped
int segment_count; ///< number of segment files already written
int segment_idx_wrap; ///< number after which the index wraps
int segment_idx_wrap_nb; ///< number of time the index has wraped
int segment_count; ///< number of segment files already written