Hello,
It seems that the tape that you are using is overwrite protected, that is the reason you are getting this error message. If you are running an overwrite job, make sure that the tape that you use for it, is not overwrite protected.
Refer to the following technotes:
Title: When performing a backup operation with Backup Exec, the alert message "Please insert overwritable media" is displayed.
http://support.veritas.com/docs/204061
Title: When performing a backup operation, the alert: "Please insert overwriteable media into the changer using the slot import command" is generated.
http://support.veritas.com/docs/230608
Additionally also refer to the following docs which give a detailed explaination of the media protection periods and the way backup exec picks media:
The basics of Advanced Device and Media Management for Backup Exec for Windows Servers
http://support.veritas.com/docs/192265
An explanation of the "Overwrite Protection Period" and the "Append Period"
http://support.veritas.com/docs/237374
Hope this helps in resolving the error. In case it doesn't revert with details.
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Regards.
