Same as in os X.
If you want to mount the ipod as an external firewire harddisk, you have to mount it first using itunes. I don't know how anymore, because it was some time ago and the setup was very easy and natural going (just apple! 😀 ), but if you open itunes and then hook up your ipod, you should be getting a setup window, both in os 9 as X.
Ohw, and if you connect your ipod to another mac, it usually asks you to make this your standard mac for synchronising, always say NO! Else you lose all your songs on the ipod and you'll have to sync them again with your own mac.