How to fix the USB when it lost space

Sometimes, there is not much things in your usb. And it shows that there is no much space left in your usb.  Your USB lost space. But it can be fixed.

First move the things in your USB to another place. The steps here will make things in USB lost.

In a windows environment, follow the steps

1. In the start menu, search for and launch diskpart.
2. Type list disk to see all current disk volumes on your system,
3. Plug in the USB and type list disk. Note the newly listed volume, that's your USB's.
4. Type select disk#, where # is your USB's volume number.
5. Type Clean to wipe the volume of alll partitions.
6. Type create partition primary to make a new partition with all unallocated space.
7. type exit to finish.

When I tried to fix my USB, I tried steps 4,5 twice. It did not work at the first time.

When I tried to use my USB, it showed that I need to format the USB. And I formatted the USB. It got back to normal.