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#11
Hi ThumperSD. I found this solution an an MS support page.
1) There may be an issue issue with the USB controller on the machine. Installing the hotfix from http://support.microsoft.com/kb/976972 would help.
2) There may be an issue where a bad sector returns the "file not found" error. If you run chkdsk /R on the target, it detects such bad sector and then backup will ignore these automatically.