If the allocation is for a stand-alone tape drive, the information that you specify on the TAPEUNITNAME subparameter of the STORAGEGROUP parameter of the SETOAM statement determines the specific device type that is allocated for the tape volume. Tape volumes that are allocated to stand-alone tape drives are not SMS-managed (the objects on the tape volumes are SMS-managed, but the tape volumes are not). Therefore, the TDSI information (media type and recording technology) of the data class is not necessary for non-SMS-managed volumes. However, with the introduction of 3592 tape drives that read and write in multiple recording formats, in order to request a lower recording technology or to request data encryption, you need to specify the recording format in data class to ensure that the desired recording format is used during OPEN processing, otherwise the drive defaults to its highest non-encryption recording format.