click on the U disk Letter Error Repair method:
One, right click My Computer, management-storage-Disk Manager, on the right side of the interface can see the logo on behalf of the Flash, click on it, select "New section", as prompted to complete the format of operations, the problem is expected to be resolved.
Second, download the "star Shuttle low-level format tool" for the low-level format of flash.
U Disk Repair Tool (Portfree Production program 3.27) use:
(1) Please click "OPTION" in the lower right corner of the software.
(2) Please select "Others" and select "Type"-> "removable"
(3) Please select "Capacity Adjust", where you can select the capacity of your U disk; If you don't have the capacity you want here, please click "ADD" to fill in the capacity you need.
(4) Please select "Flash Test" and select "Low level format"; There are two parameters, one is all Blocks (it means low format entire disk), and the other is good Blocks (it means a lower-formatted block, which is suitable for U disk with Bad zone)
(5) In accordance with the above selection, please click "OK", save the settings, and then the U disk to the computer, click "RUN", start the low format. After formatting, you can use it normally.