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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
When Windows 2000 Backup (Ntbackup.exe) is scheduled to run at a later time and you choose to overwrite the existing tape media by using the /um switch, the backup never completes. When you look at Scheduled Tasks, the jobs status reports it is still running, and Task Manager still shows Ntbackup.exe on the Processes tab. If you view the work queue under Removable Storage Manager (RSM), the last item that is listed is a MOUNT operation by Backup. Also, if you start another interactive backup session and look at the backup report for the scheduled backup job, it is totally blank.
The tape that was mounted contains a media label that was written by a third-party program that uses a proprietary media label type. A proprietary media label type is a non-Microsoft Tape Format (MTF) label. The Windows 2000 Backup program is waiting for a response to the following message:
Because the Windows 2000 backup job was scheduled and is running in the background, this question cannot be answered by a user, and this prevents Backup from continuing.
The requested media is not blank. It was created by another application.
Do you want to continue?
NOTE: The /um switch was designed to only overwrite tapes that contain an MTF label, Free Media label, or tapes that do not contain a label (unrecognized). This allows you to share the tape drive with other third-party programs that use their own media label type without worrying that they will be accidentally be overwritten by Windows 2000 Backup.
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
IMPORTANT: Before you proceed, you must use Task Manager to end all instances of Ntbackup.exe that may be running on the Processes tab. After the Ntbackup.exe process is ended, use RSM to manually dismount the tape that was left in the tape drive from the canceled backup. This allows the tape drive to be used by other programs including future backup jobs.
If you want to use other program's tapes that contain a non-MTF label with a scheduled Windows 2000 backup job, you will first need to use RSM to deallocate the tapes from the program that owns them, and then prepare those tapes. This writes a new "free media label" to the tape and allow unattended backups to use them without generating prompts. To deallocate and prepare media in RSM:
For additional information about media recognition, click the article number below to view the article in the Microsoft Knowledge Base:
(https://support.microsoft.com/kb/250468/EN-US/ )How Removable Storage Manager and Programs Recognize Media