“Back in the day, computers used “A:” and “B:” for floppy disk drives. When hard drives arrived, they became “C:” because floppies still existed. Even though floppy drives are obsolete now, “C:” stuck as the default drive letter since so much software assumes it. “A:” and “B:” remain unused but assignable.”
Go to The Curious History of A:, B:, and Why C: Rules the PC for the description.
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