iPod Update 2004-04-28 supports all models of iPod and iPod mini introduced before April 28, 2004. To take advantage of new features in iTunes 4.5 and the iTunes Music Store, you must install the software in this updater. Changes for iPod without a Dock connector

Compatibility with iTunes 4.5 and the iTunes Music Store Improved playback performance

Changes for iPod with a Dock connector and iPod mini

Compatibility with iTunes 4.5 and the iTunes Music Store Improved playback performance Support for the Apple Lossless Encoder, to enable compressed music encoding at high quality