I'm trying to put iOS5 on my devices. I did an update last night and noticed that everything is going on the main hardrive on my mac. So i took that folder and moved it to the external, then changed the preferences in iTunes so it would recognize that folder. Well today I go to do the new OS and its telling me that it cant find anything. So I started to transfer all my purchases to itunes again and its still going on the main hard drive. What am I doing wrong that I cant get everything to just live on the external. Does it HAVE to be on the main drive?