How to reformat usb flash drive after formatting it in mac

I know this might sound stupid but I used a 16gb kingstonflash drive for a backup for my macbookpro since there are only few to back up and I was thinking I can copy the backup files to an external disk after. With that said, I used the time machine and it said that it would erase everything on the USB. I clicked okand then once the flash drive was "made compatible", it started to backupbut the total file is 34gb so I can't use the flash drive as back up.
I tried reformatting the flash drive, but the total free space is 198mb and even if I removed the partition or erase ( I see a hitachiand kingstonpartition when I looked at the disk utility) it never goes back to the 16gb. I checked it with windows and the USB space is also 198mb out of 198mb (free space) I don't know where the 15.9gbwent.
Any help is greatly appreciated.

Them do it on a Mac with Disk Utility.
On Windows you might have to first delete all the partitions before you can select Convert to MBR.
But try it on OS X.
Open Disk Utility with the drive connected and select the Top name of that drive in the left most area of the window.
Then in the Partition Layout drop down select 1 Partition. Then the Options... button will become active, select that button.
Select Master Boot Record and click OK. The format should already be MS-DOS (FAT) but if it isn't select that. You can give it a name or not. Then Click the APPLY button.

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How to reformat usb flash drive after formatting it in mac

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