Why cannot mirror certain files to flash drive?

[wideeyedguy]

What might be causing this?

I am receiving "Error Code 82" when attempting to Mirror files from a hard drive to a flash drive. Some of the files are being copied over successfully, while the majority of the files in the HD folder are triggering this error.

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7:35:50 AM Error Cannot copy file
"L:\Uniform and Equal Analysis\0370580220052 (2012 U&E) 5606 Bissonnet St (APARTMENTS).xls" to
"J:\0370580220052 (2012 U&E) 5606 Bissonnet St (APARTMENTS).xls.ffs_tmp".
Error Code 82: The directory or file cannot be created. (CopyFileEx)
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I've even deleted all of the files on the flash drive and started clean and I get the same errors.
See attached screenshots.

What might be causing this?

Thanks,
weg