Alec, So are you saying that the Free memory display on the screen is not correct?
Assuming it's not far out, and if the 8Mb card capacity is 8,000KB the overhead seems a bit excessive at just over 17% of the card's capacity. I agree that the larger the card, the less the effect and indeed, the 32Mb overhead drops to just over 5% of capacity.
Incidentally, the 'lid' on the KN7000 acts like a fridge door - close it, and the 'lights' go out. All LEDs and the screen are disabled

by a little projection on the left end of the keyboard, operating a small push switch on the panel - nice feature

no point in wasting power if you don't need the lights.
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Willum