Q: Message pops up in iTunes ipod appears to have corrputed files.

Could you have had a previous sync interrupted? That's my first thought...

Until someone else comes along with a different/better take on this, have you tried using your computer to scan your iPod for disk errors? If not, and you want to try that, just make sure you set iTunes to NOT automatically sync whenever you plug the iPod in, otherwise you won't be able to scan due to the drive (your iPod) being used in another program that's running. (To set up for non-automatic sync, in iTunes, here is the path: edit -> prefernces -> "devices" tab -> check "prevent iPods, iPhones and iPads from syncing automatically") There's a possibility, though slight, that your computer might be able to repair disk errors to the point of usability, should there be disk errors on your device.

However, I'll gladly defer to the experts here who have a more definitive take...