Sometimes if the USB is attacked by virus, it occurs this problem. Because your data lost. To solve this problem, you can use 4Card Recovery. You can downlaod it for free.
On brand new USB disks sometimes, from value companies, they may require a formatting, I assume it is a new USB memory stick, allow it to format to "NTFS" if that is not an option let it format to "FAT32" Hope this helps.
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