You can determine the block size of a file by multiplying its
record size by its block factor.
To copy a file when you do not know the block size or when the
block size varies (as it could on a magnetic tape), use
records of undefined length for both files.
In the file equations, specify a record size at least as large as
the largest record you expect. For example,
>:FILE OLDTAPE;REC=-16384,,U,ASCII;DEV=TAPE
>:FILE NEWTAPE;REC=-16384,,U,ASCII;DEV=TAPE
>FROM=*OLDTAPE;TO=*NEWTAPE
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This copies all records from the first file of one tape to
another tape, preserving the record structure. You
can use the FILES parameter to copy more than one file. If
you are copying an MPE V/E store tape, specify the
number of files stored plus six. These extra files contain tape
header information for the STORE program.
