i have a canon 550d, bought recently. i can't take photos from the sd card. it used to work until it stopped working today. i tried formating card in camera, that does not do anything. i tried using another sd reader and nothing. i do not have a mac with an internal sd reader, i use an sd reader that connects to mac via usb. many people have this problem. shouldn't it just mount? otherwise i can't get photos from my sd card. what's the point of having a digital camera if you can't take photos from it on computer. can't it 'just work'? and sd card works fine in camera. i can view photos and videos on camera and can take photos on it.