I have the same problem.

Try to re-initalize your tape drive, before you run the backup job.

cheers
"Fons Hof" wrote in message
news:3ecce203$1@hronntp01....
>
> Hello, Lately I installed BE 9.0 for win server. evrything seems to work
fine
> and gentle except the adamm database
> on all bu-jobs there are events with the following description.
>
> Adamm Mover Error: Unlock Device Failure!
> Error = ERROR_INVALID_FUNCTION
> Drive = "OnStream 1"
> {8C3D77A7-CB45-488A-9CF1-841D95AC9A1C}
> Media = ""
> {00000000-0000-0000-0000-000000000000}
>
> I am running a simple w2ks machine and using a standalone tapedriver
>
> does anyone have a solution???
>
> greetings Fons Hof