Hello,
Yes Backup Exec does support a mixed media library, however in that case you will have to enable the bar code rules. Most mixed libraries do have bar code rules, thus you will have to verify if you have enabled the bar code rules. Refer to pages 207-209 in the administartor's manual for backup exec 10.0 for more information. You can download it at the following link:
Title: http://support.veritas.com/docs/269777
Hope this answers your question. In case of doubts, revert with details.
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Regards.