Robocopy - 0xb exit code

Not sure if I'm in the right forum or not.. I'm actually performing this Robocopy on Server2008 but Robocopy is included in Windows 7 as well..

I wrote a simple script to backup one hard drive to another hard drive and mirror it. It looks like the script ran successfully but task manager is showing an exit code of 0xb. I did some looking around on what this means but was unable to come up with anything.

Anyone have any ideas?

 

hex 0xb is decimal 11

"Any value greater than 8 indicates that there was at least one failure during the copy operation. "

error 11 is FAIL XTRA COPY

there is something in the destination file that was not present in the source file