The vertical columns in a punch card contain a series of punch holes which represent each character.
This is the smallest amount of information, a single difference which we called a bit
Two light switches(bits) can store four unique states
Magnetics cores have replaced vaccum tubes for many importnat functions in data processing systems
The size of a bit has been rapidly shrinking since the days of punching card.
A hard drive in a modern computer can be thought of as billions of tiny magnetic cells.
資料來源: 计算存储空间
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