PowerTunes > Help > Store your music on an external hard drive
Store your music on an external hard drive
If you already have your iTunes music set up on your internal hard drive and want to move it to an external hard drive, select your iTunes library in PowerTunes and then select "Move/Copy Music Folder" from the Library menu. Choose a new location and name for your music folder on your external drive, and PowerTunes will copy your music there and change your iTunes library to use the new music folder.
If you also want to store your iTunes library itself on your external drive (e.g. so you can connect the same drive to another computer and open up the same library on that computer), then after copying the music folder over, use the "Duplicate Library" command in the File menu. In the configuration sheet that appears, click the "Custom location" button and choose a location on your external drive to store the library. A new copy of your library will be created there with all the same tracks and playlists as the original.