External hard drive

I love to download music and my computer has a small hard drive I don't wont to fill it up with music. so I picked a cheap one up and a case set for it on ebay. I initialized, partitioned and formatted, it show up as there I never used an external hard drive before. can anyone please explain how to read and write on it?
 
Dbl-click on it to access the device,
navigate to your music fold on the pc in another window

and now you can drag-n-drop to the external device.

During a download, you get to pick the target folder, so you just navigate to the external device and click Save
 
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