With the Microsoft Zune you can beam songs to other Zune's, but they are deleted after three plays. This is an easy way to keep those songs.
NOTE: I am NOT LIABLE if you violate copyright laws when sharing songs.
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Step 1: Set the Zune up for storage.
To set it up for storage:
1. Install .NET Framework 2.0 from here: http://www.microsoft.com/en/us/default.aspx
2. Download the ZuneHDPatch from here: http://cppworld.com/Zune/ZuneHDPatch.exe, and run it on your PC with your Zune unplugged and the Zune software closed.
3. Plug your Zune into your PC, and it should appear as an external HDD.
4. To copy files, make sure the Zune software is running and set to "syncing."
This is a great way to use the Zune as a portable HDD. If you would like to keep shared songs, go on to step 2.