Page 1 of [VIDEO] Getting data out from an air-gapped computer

So you've somehow managed to compromise a PC somewhere, but it's air gapped (meaning the only things that are physically connecting this PC the outside world is the power, it's not on the internet because perhaps it contains very sensitive data).

How do you get the data out of it? One ingenious idea (which would obviously only work if you can see the PC itself somehow...) is to use the hard drive light to transmit it!