Some time ago I bought a USB connected XQD Card reader but the card I placed into it did not come up on my desktop PC or laptop at all. Having just received a couple of used XQD cards I bought off the internet, I now know the reason why. Some cards no not have the "USB" logo on them, and it appears that these cannot be read by USB-powered card readers ! Whose stupid idea was this? Does that mean that the cards without this logo can only work and be read when in a camera? Is there any way to get them to read in a PC other than by leaving them in the camera and connecting it to the PC via a dedicated lead?