IBM 5110 User Manual page 81

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The file headers contain information about the file, such as the file
number, file name, file type, and so on. Each file header requires 512
bytes of tape storage.
Now, if you want to format additional files on the tape, you must use
the )MARK command again. For example:
) t1ARK ~;~O 1 6
L
Starting File. Remember, in this
example, five files are already,
formatted.
10..-_ _
Number of Files to Mark
File Size
The tape is now formatted as follows:
File 6 Header
~
/
I~
4
I I
5
I I
6
/
/
File 6 is formatted Unformatted
after file 5. Tape
When the information in a tape file is no longer needed, you can use
the )DROP command to mark the file unused so that the file is
available for other uses. However, once a file is formatted, you
cannot increase the size of the file without re-marking the file. When
you re-mark an existing file, any information in the files following the
re-marked file is lost. For example, assume you want to increase the
size of file 4 on the tape from 10K to 15K:
'-.--I
"' -
You want to increase the size
of file 4 by 5K.