Many thanks for the helpful responses to my query below regarding "brand names." All helpful to a newbie. My question is this: there is an SD card in my machine Philips Respironics RemStar Plus CFlex System One 260. Does this mean the card is recording efficacy data? If so, can I use a piece of down...

I am confused about the use of the names RemStar, Respironics, System One, Philips- I am shopping for a new machine exactly like my old one: Philips Respironics RemStar Plus CFlex System One, but when I check, say, Craigslist, I cant tell what's for sale, even with a picture I'm not sure what I'm lo...