No....not possible. If you have the factory installed Nav, then you have the 40 GB hard drive, too. What are you trying to record from....cd?...flash drive? If the HDD button is greyed out, it just means there's nothing recorded onto it yet. Just hit the record button and it will ask you if you want to record just the one song playing or all songs.
I would have to agree with the previous post that you would get the hard drive with the navigation option. I would recommend contacting your dealership for further usage instructions. If you have further questions, please feel free to contact me. Thank you.
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