Right, here's the situation. The supplied card with my Nexus one works fine. I ordered a 16gb class 6 card from ebay (second hand) and it works fine in my Win 7 64bit PC. I formatted it to FAT32 using both the inbuilt Windows formatter and a standalone application. Nothing I do seems to allow the card to be read by the Nexus. I get the "Blank card or unsupported file format" error. I have Google'd the issue, but most people have the issue of broken cards, which this one isn't as my PC will see it. Any help is greatly appreciated.