Disk Erasing to MS-DOS FAT big problem

I tried erasing my flash drive using disk utility because it had a virus. I set my flash drive to MS-DOS FAT so I can use it for windows. When I erased it, I noticed the the drive was now Mac OS Extended. Now when I plug PC its now reading only 200MB out of the 4.11 it currently has? CAN SOMEONE HELP

I tried erasing my flash drive using disk utility because it had a virus. I set my flash drive to MS-DOS FAT so I can use it for windows. When I erased it, I noticed the the drive was now Mac OS Extended.
Well, the obvious response here is that you've done something wrong. Is this the same flash drive that you said, on another thread, was partitioned into two volumes, one Mac and one FAT? If so, did you erase the right one? Are you looking at the Mac volume? Did you want to repartition it to only have one (FAT) volume?
Now when I plug PC its now reading only 200MB out of the 4.11 it currently has?
4.11 what? That's an odd number. Where's it coming from?

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