A recording system and a recording and/or reproducing apparatus in which a first information unit signal is recorded on a recording medium; a first data unit signal relating to the first information unit signal is recorded on the recording medium at the rear side of the first information unit signal; when a succeeding second information unit signal newly appears thereafter, second information unit signal is recorded on the recording medium at the rear side of the first information unit signal; and a second data unit signal relating to the second information unit signal and the first data unit signal are recorded together on the recording medium at the rear side of the second information unit signal.