You could add this after the copy command. This way the script will show the error code and text on the screen, sleep for 5 seconds and then exit so it will not deleted the stuff on the USB drive because then things obviously would be fubared.

Code:

If @ERROR
	?"Eeks. Some kind of error occurred while copying: " $file
	?@ERROR
	?@SERROR
	Sleep 5
	Exit
EndIf
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