When you notice that your SD Card or USB thumb drive is missing a lot of space.  The fix to get your space back and get Windows to recognize the USB drive is in the form of the best usb drive/sd card formatting tool ever, the lexar  USB Formatting tool. Once you format with the Lexar USB format tool, windows will prompt you to format the SD card or USB drive and then Voila you will have your full space back.  Easy right? lexar_usb_tool Lexar USB SD Card format tool