As a side note - I just today ran into A:\ as a path.... and on Win10 no less. Every time one tries to load a device driver manually via Device Manager it still after this many years defaults to seeking it from a floppy drive - amazing legacy. I should but one of these devices - my Windows would be so happy I'm sure.
Thanks for pointing out this video -- I never would have figured out how to remove the handle to access the floppy!
Last summer after a powerful thunderstorm the TDS3012B wouldn't boot up for a few days. Thereafter I have unplugged everything from the mains if the weather is going to be dodgy, or if I am going to be travelling for a few days.