Technically it's not a cd solution it's a DVD solution that could hold 4.7 gigs per disk... cutting the amount you carry drastically, it'd pretty much be the entire contents of your 6 disk changer on one DVD. But I get your point, empeg, music keg, dension, or a neo are the only other hd units out there that I know of. Pioneer has some but from what i understand they really bite the big one.