I have a 16 gb 4th g Ipod Nano and I tried to put pictures on it. When I am in the main menu the pictures I tried to put on show up on the bottom as previews but when I go into photos they are not there. When I plug it into my computer, Itunes opens and it begins syncing the photos. Then a message comes up that says" "Itunes cannot sync photos to the Ipod. Disk cannot be read from or written to" On my computer is says that the photos are there but I can't view them on my Ipod. I am also using Iphoto for the pictures. I am using a Mac. Someone please help me.