I have downloaded a image file of Chromium OS and mounted it into my pen drive (4GB) using Ultra ISO software. It occupied 2GB of my drive. Later I formatted the same in Windows using FAT32 but even then the size left on my pendrive is shown as 2GB.
Another strange thing I observed is that I am getting another file system called "exFAT" while I format which I didn't see any where before.
How can I format my pen drive removing the mounted Image and restoring back the total memory of the pen drive to be 4GB?