I have a Series 3 (OLED) TiVo with two S-cards in it. Everything works good. I also recently got a hold of a Series 3 Tivo (TCD652160). I know it can take either two S-cards or one M-card for its dual tuner functionality. Since my local Comcast office is currently out of M-cards, I was gonna maybe just use one of the S-cards from my other TiVo in this TCD652160. Can just one S-card be used in a TCD652160? If so, I realize it would only have one tuner. I also realize pulling an S-card from the other TiVo (OLED) unit will make it one tuner as well, but both of these units will most likely be put in a basement area that is not heavily used and one tuner would be fine for now (& until I can maybe get a hold of an M-card from Comcast). Our main floor has two TiVo Premieres with M-cards & they are the ones that get the most use. Just wondering about one S-card use in the older Series 3.