USB drive needs to be formatted error

Some times we may meet such a disappointed thing that can not use the USB drive, which means that the USB drive needs to be formatted before we can use it. The prompt may be USB drive is unformat do you want to format it now? Running CHKDSK, it says CHKDSK is not available for RAW drives. In that case, it seems we have no choice but to format that problematic USB drive if we want to keep using it. The good news is that though we have to format that drive, we do not need to worry about data saved on it previously. Actually, we can restore those files from the unformatted USB drive and then format it.