Error message: Attempting to copy to the disk "Data" failed. An unknown error occurred (-54)

I got this error message “Attempting to copy to the disk “Data” failed. An unknown error occurred (-54)”  while syncing my iPhone6 Plus (IOS 9) to iTunes 12.3.0.44 (64-bit) on Windows 7 / Outlook 2010.  What does it mean?  How...
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