Hello,
When do you get this message in Backup exec? Is it a backup job or a restore job? Make sure that you have inserted the correct media before you try this operation. Refer to the following technote:
Title: Event ID 58061: "Please insert media '%s' into the drive. Respond Yes to acknowledge. Respond No to retry the operation. Respond Cancel to cancel the operation" is reported in the Event Viewer Application Log.
http://support.veritas.com/docs/253548
If the issue persists, do elaborate on the problem.
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Regards.