I am going to be purchasing a new MBP here within the next week but have a question regarding Itunes. Right now I have my entire library (about 45GB) on my PC but will transfer it over to my MBP. Here is my question...Can I leave my library on a seperate external harddrive and then just plug in my Ipod to update podcasts? If I don't have my external plugged in, will my library be saved but just unreachable or will it disappear? If its not plugged in...will my Ipod erase everything on it because Itunes cant see the library? I know this sounds weird I dont really know how to ask it...but I am just wondering how hard it is to operate Itunes and the Ipod when your music library is on an external HD. I don't want to take up 45GB of space on my 120GB HD (which will be like 90GB after I open the box).