Q: iPod Classic Gen 7 got wet !!!

I got it completely wet last Monday. And the worst thing is I left it about 10 minutes until I found out. I quickly put it in a rice bow. I left it overnight and the next day, I checked it and it seemed ok. The battery was fine, the screen was fine. I still can listen to the music. Everything was fine until yesterday. When I plugged my iPod into my Mac, the computer didn't recognize it although the iPod showed :"Connected". Today, I did it again, and I can see the iPod icon on the screen of my computer. However, when ever I tried to click on it, my computer went freeze and I have to force quite the Finder. Also, I couldn't open the iTunes whenever the iPod was plugged. And there was a board with a RED X show this : "You can still open or copy files on the disk, but you can’t save changes to files on the disk. Back up the disk and reformat it as soon as you can.". I don't know what to do now and I really need you guys help. Is my iPod completely trash now or there is still a way to fix it ? Please help me cause I don't want to lose it. It's a special gift from my Dad. Please help me !

P/s : Forgive my English. Not very well