[IT] Recovering Unallocated Space in USB disk

Source:
http://geekswithblogs.net/ilich/archive/2013/04/26/recovering-unallocated-space-of-a-usb-flash-drive.aspx

My 2GB USB Flash disk suddenly only detected as 2MB. When I checked it in the Disk Management, the rest part of it was unallocated.  T__T

So, I google the way to recover the part and it was as simply as 5 minutes of working.
First go to command prompt, type:
C:\diskpart
Run in administrator, and a window will appear, then type list disk
DISKPART> list disk
Choose the Disk that represent your USB Flash Disk (see it from the size). e.g Disk 2
DISKPART>select disk 2
Clean the disk
DISKPART>clean
create partition in the disk (allocate the disk)
DISKPART>create partition primary
DISKPART>exit

Now, from the windows explorer, you will see your USB with the real size. Right click the USB drive and Format it.

Now you have the allocated and formatted USB flash disk. :)