ipod won't sync, it says it's corrupted and when I restore it it still won't sync

Alright well I have an 80 gb ipod classic. I tried to restore it because it wasn't working right. Songs would skip over, or it would play songs that it wasn't displaying on the screen.

Anyways, after restoring I attempted to sync it again with my library. A few different things happen though. It will either say nothing, and when I disconnect it it says there's nothing on the ipod. Or it will say that the ipod is corrupted. Or it will say something about needing to restore the ipod because the recovery process didn't work. And the whole process just keeps looping and looping over and over. I've been dealing with this for a few days now and I have no idea what to do. Any help? Thanks in advance!