A search seems to mostly bring up guides on how to move the iTunes library with migration assistant or otherwise restore it into a default location, but since I don't store things in the default location, it turned out to be a bit harder to find resolutions. Over the years, I have done so much work with playlists and all kinds of library sorting that I'm absolutely terrified of testing stuff out without knowledge of how to do this correctly, it'd be a disaster if my library metadata got overwritten or trashed somehow. The music files are obviously safe, but it's not enough. My old Mac broke, and I cloned the old operating system inclusive hard drive to my new Mac. On the old computer, iTunes music files were stored on an external USB hard disk. Sometimes when iTunes would lose the path to the files (had I launched iTunes before connecting the USB disk), it would find it again when simply given the folder path in the format "USBdisk/iTunes". In order to get rid of that unpractical USB disk business, on the new computer I'll want to keep the music files on an internal disk. But to keep the operating system disk as spacious as possible, I still won't want the music to go to the default location "User>Music" etc., but on another internal HD that I got solely for file storage purposes. I moved in my old iTunes folder from the USB disk as is, but now if I launch iTunes with alt pressed down in order to specify the library just as I had done before, the path in the format "newinternalHD/iTunes" is invalid and it won't accept it. The paths are so similar in nature, why isn't it working as before and what am I doing wrong? What's the actually important file called (and where is it), that truly stores the playlist, rating etc. information? Because up until now, the only path I ever gave iTunes regarding library location was USBdisk/iTunes, just like that. A less important but related additional issue: Because iTunes sometimes dropped the custom library location, I have noticed that it sometimes accidentally saved a few music files into User/Music/iTunes. Playlists and all other such information is obviously constructed by using both, this default location oddball files as well as the ones in the external disk iTunes directory that I meant to be the real one. Is there a way to migrate the odd ones into the main location without losing them from the library and the playlists?