i ever had this problem last year when i bought a new laptop and wanna sync my iPod to the newly installed iTunes on my new laptop. my solution is using a third-party program-Aniosoft iBackup to make it. Aniosoft ibackup, It enables you to transfer iPod's music and other content to any storage device and iTunes as well. And both the backup in the storage device can be recovered and restored with no any change and no any risk.And the data in the iTunes is quite in accord with the iPod's data including its playlists,rating and etc.