To format large drives using FAT32 in Windows, you can use a program called Swissknife:
- install it.
- plug your hard drive in your pc
- open the program.
- click your drive in the devices list.
- click format to erase everything.
- once finished click partition type and select primary and then file system and select fat32.
- drag the bar to the right of the pie chart all the way to the bottom, so the whole pie chart turns blue.
- click create.