Originally from: http://support.apple.com/kb/HT1451 Learn what to do if you don’t see all of your songs, albums, playlists, or other imported content after you update iTunes on your computer. iTunes keeps track of your content and playlist in a library file. If iTunes can’t update your library file immediately after an iTunes update, you might notice…Read More
iTunes: What are the library files?
Originally from http://support.apple.com/kb/HT1660 iTunes uses iTunes library files and your iTunes Media folder to organize and store your music and other media. Your iTunes library files track the media you add to iTunes, how you’ve organized it, and other information such as playlists, play counts, and song ratings. About the iTunes Library.itl fileThe iTunes Library.itl…Read More