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Partially. I am old enough to remember computers with one floppy drive (for old software, explaining the A:-position), but too young to have experienced the times when you needed two.

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You never NEEDED two. All two did was make it easier to copy disks, and sometimes make it so you changed disks less often.

I'm from the time when A: meant 3.25" and B: meant 5.25", but you certainly didn't need a B:.

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