Will syncing your ipod delete all the songs you have?

YES!!!! if you delete your songs from your computer or the iTunes it will erase them from your pod. maybe not as soon as it gets hooked up (it might do some funky stuff before hand), but it will. i just got done deleting my whole itunes software and all the music in it, thought i could reinstall itunes and then hook back up my pod to get them all back, oh no it only works with the purchased songs. i lost 3,554 songs i collected over the years. i am super pissed at mac and it's whole opperating sysytem right now because this isn't the first time I've had problems with them. back up all your stuff if you know how or can too by the way jus tin case something does happen.