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Volumes are normally chained into a group when a data set spans more than one volume. This can happen when the data set is created or recreated, or when the data set is extended (using DISP=MOD access).
However, Control-M/Tape also chains a set of volumes that is accessed in sequence when an active volume is dismounted and a scratch volume is mounted during End-of-Volume processing. In this case, the volumes are kept as one chain in the Media Database (meaning, they point to each other) if the dismounted (active) volume is not part of a different volume chain.
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