File transfere to external disk

Hallo,
kann mir jemand behilflich sein. Die interne Festplatte meines Macbookair ist ziemlich an der Grenze angekommen. Nun habe ich mich entschlossen meine Musik, Fotos, Hörbücher und Bilder auf eine externe Festplatte auszulagern.
Ich habe die neue Festplatte in 10 Partionen aufgeteilt, damit mir nicht wieder das selbst passiert, wie mit der internen Festplatte. Jetzt verstehe ih aber nicht, wie ich die Dateien von der internen Festplatte auf die externe auslagern kann.
Bitte um Hilfe.
Danke Liz
MacBook Air, OS X Mountain Lion

Wenn die Dateien in Ihrem Home-Ordner befinden, würde ich den Finder, um sie zu kopieren. Warum 10 Partitionen?

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    The first step in dealing with a startup failure is to secure the data. If you want to preserve the contents of the startup drive, and you don't already have at least one current backup, you must try to back up now, before you do anything else. It may or may not be possible. If you don't care about the data that has changed since the last backup, you can skip this step.
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