jof

I keep getting this error message - randomly it seems - after transferring files. My questions are: - why does this happen? what is the easiest way of determining which files are damaged so that I can re-transfer them? for instance, if, whilst on intelligent shuffle all, the player comes across a 'damaged' file, I have no way of knowing what song it actually is (artist=no name; album=no name; title=no name etc etc) hope this is clear, and that someone can assist. many thanks Jof