Be sure you've updated your drivers.  One of my laptops said this was only 32GB, but I updated the drivers for my card reader and it -then- showed up as 64GB SDXC.Works in Acer Iconia A700 -after- formatting as FAT32.  You can't do that natively in Windows, but there are tools out there that work.Great item, great price, and arrived three days BEFORE anything else I ordered on the same day.  Great seller.