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to get it all on the external drive first go to advanced preferences and make the external drive your iTunes media folder, if you click change you can browse to it.
then go to File - library - organize library and then choose consolidate. It will copy all music files not already there to that drive. Make a backup copy of the music drive and then delete them from the internal drive.
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to get it all on the external drive first go to advanced preferences and make the external drive your iTunes media folder, if you click change you can browse to it.
then go to File - library - organize library and then choose consolidate. It will copy all music files not already there to that drive. Make a backup copy of the music drive and then delete them from the internal drive.
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