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In both main and secondary memory, information is stored as patterns of bits. Recall from chapter two what a bit is:

A bit is a single on/off value. Only these two values are possible.

The two values may go by different names, such as true/false, or 1/0. There are many ways in which a bit can be implemented. For example a bit could be implemented as:

So the particular implementation of bits is different in main memory and secondary memory, but logically, both types of memory store bits.


(Thought question:) Does the information change when a bit is copied from one form of storage to another? For example, does the information change when a bit implemented as a voltage level on a wire is copied to a tiny part of a disk?