What Happens to music when you re-install ipod on pc?

I have a 20G ipod with 2,000 songs on, none of which are on my pc. My ipod no longer appears in itunes, so i am going to re-install it with the disk i got when i first bought the ipod. However, i dont know what will happen to my music, will it be deleted? Anyone re-installed an ipod with the disk, and had music on the ipod? If so, does it remain or get deleted?
Thanks

If you RESTORE your iPod you will delete all the music on it. I'd try everything else first. If you can get your computer to talk to your iPod the first thing I'd do is back up my music!

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