We used to use DLTTape IV media in a Quantum DLT VS80 internal drive as our backup drive. In 2007 we moved to a different format and the Quantum drive and associated media was relegated to our accounting network.
We've recently taken back possession of the server with this drive and decided to catalog some old year ends. The problem is that all of the tapes we've taken out to catalog have come up blank when I run inventory. I am, however, able to read the accounting backups.
The tapes in question may or may not have been created in a previous version of Veritas Backup Exec. All of the old tapes were stored in a box inside our server room. Is there something we're neglecting to do when trying to read these tapes? Is there any explanation as to why the tapes are blank?