I am pretty sure that NW 7.4 did not support LTO5 yet - that's why this device 
type is missing.

Before i do anything else, i would update the SW (of course you need an update 
enabler). Otherwise you will never be able to write a LTO5 tape to it max. 
capacity (probably you will even have a problem using the media 'as LTO4 media' 
anyway.

AFAIK, mixed media is not allowed in the same NW jukebox at all. One of the 
major reason is that for reading any device can be choosen - this is obviously 
the effect you see. If you really want to continue, you must add additional SW 
(Alphastor) and create 2 logical/virtual jukeboxes. This of course costs extra 
money.

I can not explain the authentication issue but i would not even try to check 
this out befor i would have updated NW first.

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