I've a Canon 40D, been a true champion for years. I have 2 memory cards for it and to date I've always used the camera to transfer photos over to my computer. I figured it was time to pick up a memory card reader. The 40D uses compact flash cards. But I connect the reader to my computer and then a card but nothing happens. It's like the computer isn't even detecting there's a card in the reader. The reader is working with SD cards from another camera. Is the 40D formatting the card in some funky way or what is going on here? The memory card doesn't show up as a removable disk when connecting the camera to the computer either but the computer is connecting to the camera is a device instead.