Troubleshoot Windows to go U disk without a letter

We have to use Windows built Diskpart command-line tools to reset the disk:

1. Open the cmd Command Prompt window (run as Administrator);

2. Execute DiskPart, and list disk, find the number of your USB drive (1 in this case), and then select Disk 1 by selecting it;

3. Execute clean command to erase all data, format and initialization information of the disk (that is, this step clears the Nodefaultdriveletter flag);

4. The next step is to create a disk partition for Windows to format. For u disk, we default generally on a partition, so execute create partition primary can.

5. To use a disk, you have to format it. However, with enough command line you can finally go directly to the Explorer to format the ~ if you still like the command line, then we can continue to execute the format Fs=fat32 quick.

OK, two times to execute exit, exit DiskPart tool and CMD. Now the U disk is back to normal, plug in the computer will be automatically assigned to the letter.