Please check in System event logs whether event Id 7,9,11are generated source as device you are using
Refer the links below :
Have you installed Veritas latest device drivers while upgrading to BEWS 10?
*check whether the device or drive you are using is supported and tested with BEWS version 10.0 ?
Backup Exec 10.x for Windows Servers Libraries (with Tested Drives) Hardware Compatibility List (HCL)
Also clean the drive and then start a backup
what is the version of the Backup Exec do you have ? 10.0.5520 or 10d ?
Update us on the same and revert for any further Query
Hope this will help you
Additional Information :
For information on the recent VERITAS Backup Exec security vulnerabilities, including links to the downloads for the necessary hotfixes, please refer to the following document:
Patch summary for Security Advisories VX05-001, VX05-002, VX05-003, VX05-005, VX05-006, VX05-007
NOTE : If we do not receive your reply within two business days, this post would be marked "assumed answered" and would be moved to "answered questions" pool.