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Symantec Backup Exec 2012

I am running the new symantec Backup Exec 2012 on windows sbs 2011 standard (SP1)(64bit) server.
When I try and run a backup it always fails. I have attached a copy of the fail log. Any help would be greatly appriciated.

I am using a Quantum LTO3HH
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This part is your key:

No appendable media could be mounted.
Switching to overwrite operation on scratch media.

You have a job that is trying to append to media.  The media that is currently in the drive is being protected from append.  Either the job itself is flagging it, or the Media Set is configured to block appending.  You may also want to make sure the write protect switch on the tape itself isn't switched on.
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It got to 80gb this time with Minoru's suggestion.. then failed...

Have attached the new fail log
Are you sure you have enough space on that tape now?  Also, have you tried another tape to make sure it's not a case of a bad tape?  It's definitely still complaining about there not being any appendable media.
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Its a new 390gb tape. New media set created with Append indef, overwrite protection 1 hour. Backing up 129gb of data. Starting to wonder if its the drive.. Would a faulty drive create this problem? Under the error section of the job it says: A device attached to the system is not functioning
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check this .

Test your tape drives by isolating backup exec.

You can get tape utils from Vendor website.

Disable the tape drive in Backup Exec
Delete the tape drive in Backup Exec (right click again, need to disable first) This must be done in Backup Exec! Doing the same in Windows Device Manager and rebooting did not fix the problem.
Stop all the Backup Exec services (I did this with services manager & confirmed in Windows Services)
Start all the Backup Exec services
Start Backup Exec
The tape drive should be re-detected.
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Thanks prashant9885. This has been done many times with Symantec suppport. Think they have given up with this problem..I am willing to try anything now. I will remove the drive again and make sure its removed from device manager also.. reboot, and see where that takes us
It could be a faulty drive.  That's very possible.  How old is the drive?  Have you run a cleaning tape?
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Had to play around with various settings tog et it working