This topic discusses using tape labels and specifying the file sequence number for data sets that are stored on magnetic tape volumes.

Because data sets on magnetic tape devices must be organized sequentially, the procedure for allocating space is different from allocating space on DASD. All data sets that are stored on a given magnetic tape volume must be recorded in the same density. See z/OS DFSMS Using Magnetic Tapes for information about magnetic tape volume labels and tape processing.

Related reading: For information about nonstandard label processing routines, see z/OS DFSMS Installation Exits.