iTunes sync to iPod Classic got hosed somehow

[Kenji]

I have a very large iTunes library, iTunes Mac 12.9.5.5 which I sync via USB to my 16 gig iPod Classic. The iPod is about 70% full, mostly music and many podcasts. Recently for some reason iTunes lost track of which tracks were synced to the iPod. iTunes seems to think I have nothing on the iPod. I have music sync turned off now, and all the music is still on the iPod. And all ther music is in iTunes. I don't use Apple Music or other streaming services.

 

What is the best way to get iTunes to see what is on the iPod to get back in sync?

 

 

[Kenji]

Thanks for the replies. That was a typo. should have read 160 gb. 

 

The problem was on the iTunes side. Suddenly for some reason nothing was checked. in the iPod Music page.Although there was around 100 gb of music on the iPod, all from the iTunes library. I don't know how that happened. 

 

After posting I ended up synching, and the deleted all the music on the iPod, then I selected a bunch of music to synch onto the iPod. That was what I hoped to avoid, having to re-chose all the music to put on the iPod, but it wasn't as bad as I expected. 

 

Thanks for the suggestions.