A USB what? USB Flash Drive, USB HDD, USB Card Reader, USB Camera, etc
With the USB drive in, go to Search and type diskmgmt.msc Right click the diskmgmt results and Run As Administrator. In the Elevated Disk Management window is your USB drive listed here? Does it say the file system is Unallocated Space or does it say that the Disk # is RAW and it needs to be Initialized?
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