how do i make my zune a removable disk of hard drive (i want to put my files on it like programs as backup?

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I followed exactly what it says and it does not work, i cannot see in my computer at all

1. Make sure your Zune is not connected and your software does not work Zune
2. Open regedit going to the Start menu and select "run". Type regedt32 and press "OK"
3. Navigate HKEY_LOCAL_MACHINE \ System \ ControlSet001 \ ...
4. Search for "PortableDeviceNameSpace." This should be contained in the Vid_ # # # #