When a data set is opened for OUTPUT, file sequence 1, DISP=NEW, OPEN processing will be enhanced to recognize the data class recording technology specification and will explicitly direct the 3592 Model E06 to record in the appropriate recording format. By default, the 3592 Model E06 will record in the non-encrypted up-level format EFMT3 unless explicitly changed to record in another format. However, to account for the default setting being changed at the drive, OPEN processing will always send down the recording format specified in data class, and if a recording format is not explicitly specified, EFMT3 will be used.

When writing from BOT (file sequence 1, DISP=OLD or DISP=SHR), since this processing does not go through the data class ACS routine, OPEN processing needs to determine if encryption had previously been used (EEFMT2 or EEFMT3) and ensure that encryption is requested for this next usage of the tape. So if the previous usage of the tape was encrypted, OPEN will explicitly set the new encryption format (EEFMT3) and will obtain and pass the volume's existing key management-related information to the drive (key label and encoding mechanism). This is similar to the support that was put in place with the 3592 Model E05 encryption support in handing the encryption format EEFMT2. This is also consistent with today's 3592 Model E05 drives where on reuse, if encryption was not used, the highest non-encryption recording format is specified.