You might want to check in disk management and see if the system is seeing the drive and what drive letter is assigned – Windows tries to assign the next drive letter – even if it’s already assigned to something. If you see the drive in Disk Management – then just assign it a different drive letter and it should be fine.
You have to assign a drive letter to this device, e.g. F, G, H
This done by going into ‘Control Panel’ > ‘Administrative Tools ‘ > ‘Computer Management’ > ‘Disk Management’ click on the USB drive and right click properties, there you assign a drive letter. When done the usb port comes alive and shows the drive.
If you are referring to not shown plugged in device, this is possible when there is a third party software restricting the use of any USB devices. Also, you have to make sure that the computer system has no setting that hides any plugged in devices.