Question regarding Netbackup 8X errors.

Is it acceptable to get 8X errors?

Is there an  acceptable number before we should start to get concerned?

We had a high number of 8X errors and resolved most of them. (the bulk 
was from a bad tape drive).
Now when we come across any 8X errors we would do a long erase on the 
media and put it back into the scratch pool.
This has corrected some of the 8X errors as well but not all of them.

Anyone have any other Ideas or suggestions on this issue?

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