Backup Fails on Last file

I am using Windows XP Backup Utility to back up multiple computers in a Windows XP environment to a HP StorageWorks Ultrium 1760 tape drive. The backup fails with the following 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." but only on the very last file of the last computer. In doing a terst restore, all files except the last one can be restored succcessfully. Any ideas?
JohnClingAsked:
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dbruntonConnect With a Mentor Commented:
I don't know what is causing the error but a cheating method would be to make sure that the last file is always a file you don't need.  That will ensure that you backup your data.

You also may wish to look at this http://support.microsoft.com/kb/817688
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szichenCommented:
Hi John

How do the backups run across the network to the tape drive? What time are the backups running? Is there another backup process running as well.

To troubleshoot I would try the backup on the last machine to see if it fails and i would also try backing up the other machines without the last one to see if it fails.
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JohnClingAuthor Commented:
Only one machine has a SCSI drive and the full backup runs from there. No other processes running. It doesn't matter whether 5 files or 50,000 files being backed up. Always comes up with error on the last file only.
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dbruntonCommented:
So the problem is the last file in whichever set of files it is copying?

For example if it copies (in order) a, b, c, d, e the problem file is e

If it copies a e b c d the problem file is d.
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JohnClingAuthor Commented:
Yes
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