How to restore USB drive storage to full capacity

Sometimes you find that you lost USB storage capacity for example after you used it as a bootable media.
to restore its capacity in windows 7:
1. Start > enter diskpart in search bar> right click diskpart.exe > run as administrator
2. in the diskpart command window:
list disk
select disk 1 (usually it's disk 1,you can tell by the capacity listed)
list partition
clean
create partition primary
exit
3. eject the USB, plug in again, windows 7 will prompt you to format, just select NTFS or FAT32 and do a quick format.
4. Your storage is back!