"Each week when I fill the jukebox, I have to label the new tapes with the 
backup date."

This reminds me about a very old issue which might still exist:
If NW labels a bunch of new (never used) tapes, it will actually run in a 
problem after the 20th tape on the same drive - this is due to the 'Max. 
consecutive errors' value for a device. This issue has probably never been 
addressed. You may want to check Auto Media Management (for the jukebox, not 
for the device). In this case, NW will label media when it is needed but never 
consecutively. This will avoid the problem - if it still exists.

Besides that, you can still use internal utilities like tape_exer(cise) to 
check a device individually.

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