I/O Read Error, But Zero Errors Reported on Dashboard

[Auggie]

I'm manually copying files over entire drive by drive (via cp -a command) as I convert from ReiserFS to XFS and a read Input/Output error just for one file got spit out in my telnet session, but no errors were reported on the Dashboard screen of the GUI and all drives were "green balled."  There were no SMART errors detected.

 

So my question is:  What errors do and do not get reported on the GUI?

 

I would imagine any and all errors, whether it be hardware related or file structure integrity, should be reported.