formatering af usb nøgle

hej.. jeg har en 8 gb usb. men når jeg setter den i min win computer er den kun på 750mb.. har haft USB´en i min ubnutu. og fuldt denne vejledning

2.Insert the CD and your USB flash drive
3.Reboot your computer into Ubuntu from the Live CD
4.Open a terminal window and type sudo su
5.Type fdisk -l to list available drives/partitions. Note which device is your flash drive (example: /dev/sda) Throughout this tutorial, replace x with your flash drive letter. For example, if your flash drive is sdb, replace x with b.
6.Type umount /dev/sdx1
7.Type fdisk /dev/sdx
■type p to show the existing partition and d to delete it
■type p again to show any remaining partitions (if partitions exist, repeat the previous step)
■type n to make a new partition
■type p for primary partition
■type 1 to make this the first partition
■hit enter to use the default 1st cylinder
■type +750M to set the partition size
■type a to make this partition active
■type 1 to select partition 1
■type t to change the partition filesystem
■type 6 to select the fat16 file system
■type n to make another new partition
■type p for primary partition
■type 2 to make this the second partition

nogen der ved hvordan man får det til og blive 8gb igen?