Large drives have dropped dramatically in price lately. I just saw a 500GB HDD for $130 delivered. Back in my Tivo days I had upgraded mine to a larger drive. With my order for a 622 just around the corner, the thought of almost doubling my recording capacity is quite exciting; however, I have not be able to find any information on this subject. Does anybody here know? If this is a taboo subject, i.e. in violation of forum rules, I apologize in advance!