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How to move your itunes library to an external driver with tuneskit 
Gather your files. 
Go to " itunes-] preferences " and make sure the options " keep itunes media folder organized " and " copy files to itunes media folder when adding to library " are checked. 
Change the itunes library default path.
On the same " preference " panel, click " change " button, then you can customize the itunes library storage directory to your external driver path. Then every time you download items from itunes, it will be saved in the customized path automatically.