I saw a similar issue but it's not quite the same (http://forum.piriform.com/index.php?showtopic=34172&st=0&p=203946&hl="sd%20card"&fromsearch=1entry203946)
I'm trying to recover photos from my Nikon camera's SD Card. It plugs in as a Portable Device on my computer (there's not issues I can access it). But Recuva doesn't detect it I think because it's a Portable Device and not a Drive. Is there a way to have it connect as a drive? Currently I connect the camera through a usb cord to the computer and it reads the SD card that way. Would it be different if I connected the SD card in a different way (it's removable from the camera)?