To enlarge on Ray's "picture":
SL Tape:
VOL1 Label
HDR1 Label
HDR2 Label
(Optional USR1-USR8 User Labels)
(TAPE MARK)
Data file
(TAPE MARK)
EOF1 Label
EOF2 Label
(Optional UTL1-UTL8 User Labels)
(TAPE MARK)
Additional files have the same format, except that the VOL1 label is
omitted. The last set of trailer labels is followed by a double tape
mark, instead of a single one. And datasets that span multiple volumes
use another type of trailer labels, the EOV1-EOV2 set, at the end of
each volume.
NL Tape:
Data file
(TAPE MARK)
(Last) Data file
(TAPE MARK)
(TAPE MARK)
There may be multiple data files, more than two, or only one file.
SOME systems write a LEADING tape mark, before the first data file.
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