Trailer labels are always written at an EOV condition on output tapes and 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.

Two tape marks are written at EOV following the data set trailer labels. If user trailer labels are written, the tape marks follow the user labels.