Windows ipod to Mac

I have a windows formatted ipod and I want to change the format to Mac.

Problem is, I lost a lot of my music when I switched to Mac, and all I have on my Mac is the music I bought since I got it.

Is there any way I can copy all the music/video from my ipod to my mac whilst maintaining playlists etc so that I can change my ipod's format and then put all the music back on as it was before?

thanks