It very likely means that you have a corrupt file system on the Gen3.
Connect the Gen3 to your PC with the USB cable.
Open Windows Explorer.
Right click on the "Gen3" drive, and select "Properties" from the popup menu.
Click the "Tools" tab.
Click the button to check the volume for errors.
Never, EVER, unplug the Gen3 from your PC without using the "Safely Remove Hardware" tool in the system tray before unplugging.
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