Welcome to the community! 
How do you get music onto the Hard Disk? I cant find that option on my CT with nav.5)An entertainment screen, where I can choose between various music sources: AM radio/DAB (digital) radio/FM radio/6 CD autochanger (with DVD)/Hard disk (there is a 10 gb hdd on board, about 0.5 gb is used, you can get 120+ albums at 128 kbps compression)/blue tooth audio/USB connection to an ipod etc/USB stick membory for the audio. There are also controls for the sound equalisation etc.
He has the Mark Levinson premium audio. I think it is only offered in the UK.How do you get music onto the Hard Disk? I cant find that option on my CT with nav.