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A: and B: were more relevant when PCs didn't have hard drives. Back then usually the OS would be on A and your current game/app would be on B.

I still remember the first game that was soooo big it required both A and B, meaning you to take the OS boot disk out (which you of course always forgot to put back in after you were done.)

Good thing I had a dad who soldered Philips' Apple ][ clone together when I was 2 so that I don't feel that old for knowing this ;)

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