Hello,
It is a Library or a stand alone device? Also check the HCL for Libararies. In case it does not appear as tested in the HCL, then too it can be used with backup exec, however in that case you will have to install the OEM drivers:
How to use OEM drivers with Backup Exec for Windows Servers
http://support.veritas.com/docs/253974
Hope that helps. Revert in case of queries.
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Regards.