Tapes opened with a disposition of MOD are controlled with the same criteria as input processing, which means the data set name in the TMC must match the data set name in the DD statement or the job abends. If the volume has multiple data sets, only the last data set on the volume can be opened with DISP=MOD.
The highest expiration date found in the existing TMC record or the JCL, is assigned to the data set opened with DISP=MOD.
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