How to repair a USB drive?
It can sometimes happen that files stored on your USB key are no longer accessible. In this case, it is possible to try to repair file errors using the utility Diskpart of Windows. If the operation fails, then it's time to reset your device to get it working again.
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Diskpart is a software tool for partitioning computer hard drives, included in Windows versions starting with Windows 2000, replacing the command Fdisk which was used in DOS environment. Wikipedia
fdisk is a tool for manipulating hard disk partitions under Linux, MS-DOS and MacOSX. Although the name of this tool is identical on these three operating systems, it is not the same program. Wikipedia