To open an unlabeled tape for input, the user must have at least READ authority to one of the following:

• To the volume
• If TAPEDSN is active, to the data sets that might have previously been defined to RACF® within the TVTOC for the volume. Because this is a nonlabeled tape volume, RACF does not automatically create or maintain TVTOC data set entries. However, TVTOC data set entries can be manually created and maintained with the ADDSD command.

If data management finds a labeled tape when opening the volume for input, it rejects the request.