I think it's the adapter. I have a 6 GB Micro SD card that did not work with the first adapter I tried, even though it worked in everything else. I bought a second adapter (also Sandisk) and it works happily. Try a different adapter and see if that resolves the issue. Let me join in with the complaint about going to miniSD, instead of standard SD. I would gladly have accepted a device that was a few centimeters bigger for the convenience of a full SD slot.