PP, I don’t know how one would gauge this–perhaps you do. When I’ve added songs to the microSD card and then inserted it back into the Clip+ and turned it on, I get the familiar “Refreshing” screen. Would the player say anything different if ones adds to the internal memory?
OK, I just added a song first, to the internal memory, and second, to the microSD card in the Clip+. Each time when I disconnect, I get the idential screen, “Refreshing your media”. And the same result when I add songs to a removed microSD card and then insert it back into the Clip+ and turn it on.
If you have, say, 10 songs in internal memory, and 2000 songs on the card, you’ll definitely notice the difference. If the Clip+ only re-reads internal memory, “refreshing” will be very quick. If it re-reads both internal memory and the card, it’ll take longer.
Again, the Sansa Connect handles this properly. I’m not sure how. My guess is that there’s some kind of “dirty” bit on the card that can be read to determine whether the card’s contents have actually changed, and then flipped.