Trailer labels are always written at an end-of-volume condition on output tapes. These labels are identified as EOV1 and EOV2 (as opposed to EOF for end of data). These labels are created in the same manner and with the same content as the data set header labels, except for the label identifiers and the block count.

At end of volume, one tape mark is written following the data set trailer labels. If user trailer labels are to be written, the tape mark follows the user labels.