When using the SETSYS USERUNITTABLE command to specify esoteric tape unit names to DFSMShsm, note that DFSMShsm rejects mixed combinations of device names in an esoteric group, with these exceptions:

• It allows the use of both 3480 and 3480X device names in a single group. Improved Data Recording Capability (IDRC), however, is not used with such a group because all devices in the group are treated as 3480s. If an esoteric group associated only with 3480Xs exists, 3480s should not be added to it, because the data already written using this esoteric tape unit name may create IDRC incompatibilities.
• 3592-1, 3592-2, and 3592-2E tape units are allowed into the same esoteric since they share common write formats. 3592-2, 3592-2E, and 3592-3E tape units are allowed into the same esoteric since they also share common write formats. It is up to the user to ensure the drives in a mixed esoteric will be used with a common recording technology. For example, if any 3592-1 drives are included, then all drives in the esoteric must use EMFT1 for output. If the esoteric mixes 3592-2 and 3592-2E drives, then all drives must be set up to use EFMT1 or EFMT2. If the esoteric contains mixed 3592-3E and 3592-2E tape units, then all drives must be set up to use EFMT2 or EEFMT2, the write formats they have in common.