I have a 32 GB USB flash drive and it's corrupted, the message it shows afterwards is: The disk structure is corrupt and unreadable. I tried to repair it with a software called Mini Tool Partition Wizard and it failed, it seems this tool works on internal and external hard disks.
How can I repair my USB Flash?
Open Diskpart on Windows. Type list disk, select (select disk ...) your USB and enter the commands : clean, convert mbr, create partition primary.
Note that the "clean" command will delete all data on the device, so this is a procedure to rescue the disk for future use, but not to preserve the data on the disk.