Hello,
I would like to know since when this problem persists ?
Are you using Veritas tape device drivers ?
If not then you can download and install it from the link given below:
VERITAS Backup Exec (tm) 10.0 - Device Driver Installer (20050315) - Includes Tape Driver Release (20050115) and Robotic Library Release (45) (Intel Only)
http://support.veritas.com/docs/275676
Kindly revert.
Regards
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