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Backing up zip files to tape using Win2003

I'm running Windows Server 2003 and just trying to backup some zip files to TAPE on my F: drive. Using the LOCAL ADMIN which has FULL rights on this drive, I get the following ERROR report using MS BACKUP.

Backup started on 11/24/2003 at 8:45 PM.

Error: The device reported an error on a request to write data to media.
Error reported: Invalid command.
There may be a hardware or media problem.
Please check the system event log for relevant failures.
The operation was ended.
Backup completed on 11/24/2003 at 8:49 PM.
Directories: 2
Files: 1
Bytes: 96,508,408
Time: 3 minutes and 38 seconds
Error: F: is not a valid drive, or you do not have access.

The operation did not successfully complete.

I've double checked permissions and LOCAL ADMIN has full rights. I'm able to access this drive but the strangest thing is it processes the entire backup so it shows in the popup display that all the data has been transferred to tape. But, when it's completing the BACKUP after 100% it gives me that error.

Help, not sure what I'm missing.
Tape drives are not usually mounted as a drive letter in Windows. Usually they're something like tapedevicename. Drive letters are used for things with filesystems on them like disk drives, zip/jaz/CD-R drives, etc.

Unless you're running some kind of "make a tape drive look like a filesystem" software, it shouldn't be showing up as a drive letter. That is, unless there's some new functionality in Windows 2003 that I'm not aware of. I haven't been able to use 2003 yet. I've been a little busy backing up 2000 servers!

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