My Asus 7 tablet has a micro USB socket. If I use a micro to standard female adaptor with a short lead, I can then connect a USB flash drive or download pictures from my camera using a mini to standard USB cable. I thought a shorter lead to the camera would be nice, so I bought a mini to micro cable. With this neither device can see the other. I also have a micro to standard female adaptor in a single lump of plastic. This won't work with the camera or the flash drive. I have two adaptors with a short length of cable - both work with no problems. I can't find any electrical fault with any of the cables or adaptors and I presume that the phenomenon is something to do with type A/B compatibility and the fifth pin. Is there a USB expert who can enlighten me?