well i want 2 put all my music on itunes then put them on my ipod then delete them from the computer library to save memory, but wen i put my ipod back in it updated it and got rid of them all
Because your iPod automatically syncs with the information on your computer unless you instruct it otherwise. so when you docked your iPod to your PC, the music is no longer on file, it erased everything on your iPod at the same time.
It is foolish to remove your music from your computer unless you have it backed up.