Hello,
Is the Dell PE 2850 a standalone drive or a library? Check if it is listed in the Hardware compatibility list:
http://support.veritas.com/docs/281670
The above list is for Backup exec 10d. What version are you using? In case it is compatible, install the latest device drivers:
http://support.veritas.com/docs/282974
If the issue persists, revert if there are any errors in the event logs in Windows.
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Regards.