z/OS MVS JCL Reference
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DSID Parameter

z/OS MVS JCL Reference

Parameter type

Keyword, optional


Use the DSID parameter to specify the data set identifier of an input or output data set on a diskette of the 3540 Diskette Input/Output Unit.

An input data set is read from a 3540 diskette by a diskette reader program, and an output data set is written on a 3540 diskette by a diskette writer, which is an external writer.

To read a data set from a 3540 diskette, the DD statement must contain:
  • A DSID parameter.
  • An * or DATA parameter, to begin the input stream data set.
To write a data set on a 3540 diskette, the DD statement must contain:
  • A DSID parameter.
  • A SYSOUT parameter that specifies the output class that the diskette writer processes and the name of the diskette writer.

Also, a system command, from the operator or in the input stream, must start the diskette writer before this DD statement is processed.

Note: The system ignores the DSID parameter on a DD *, DD DATA, or a DD statement with the SYSOUT parameter, except when a diskette reader or writer processes the JCL.


For more information about associated data sets, see 3540 Programmer's Reference. For information about external writers, see z/OS JES2 Initialization and Tuning Guide or z/OS JES3 Initialization and Tuning Guide.

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