Hello,
From the compatibility list given below please check if your device is supported
(title) Symantec Backup Exec for Windows Servers (tm) 10d (10.1) Hardware Compatibility List. Includes HCL information for supported drives, libraries, virtual tape devices, fibre-channel HBAs, switches, routers/bridges, and iSCSI components. For printing purposes, the latest version of Acrobat is recommended.
http://support.veritas.com/docs/281670
If your device is tested install the latest drivers from the following link
http://support.veritas.com/docs/281696
What are the errors in the system and application event logs
Thanks.