Some Philips documentation distinguishes between "user tapes" and "super user tapes". Super user tapes are tapes that have a continuously recorded stream of audio, with continuous absolute time codes relative to the start of the tape, and contiguously numbered tracks. In contrast, non-super user tapes may have one or more section that has no absolute time code and tracks that are unnumbered. The Renumber button that makes the recorder find all the track markers on a tape and makes sure that all track numbers are contiguous (which might not be the case if the user splits or merges tracks), only works on super-user tapes.