//anyname DD DCB=DEN=x,UNIT=(xxxx,n,DEFER)

The DEN parameter specifies the density at which the labels are written. The UNIT parameter specifies the device type, number of units to be used for the labeling operation, and deferred mounting. DEFER must be specified to delay mounting a tape until IEHINITT is ready to process it. If DEFER is not used, the volume specified in the JCL will be mounted by allocation. When IEHINITT gets control it will detect this mounted volume and will unconditionally demount the volume. This provides the operator an opportunity to verify that the correct tape is mounted.

The name "anyname" must be identical to a name specified in a utility control statement to relate the specified units to the utility control statement. You also can code DISP=(,PASS) to cause the tape to remain mounted on the drive for use in subsequent job steps.