"The answer lies in the words "Windows: No Disk", your PC is looking for a USB
device - e.g. a USB stick or a cell phone - that you've recently plugged in
and have removed without using the "remove hardware safely" option in the
right hand bottom corner of your screen. Put the last USB device you used
back into the USB port and then use the "remove software safely" option.
The pop up message will disappear."
In my case, I didn't have to plug the USB device in, I just needed to click on the "Safely Remove Hardware" icon in the system tray, and tell it to remove the device that is no longer plugged in.
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