Difference between main memory and secondary storage:

Main Memory Secondary storage
In Main memory or Random Access Memory (RAM), the data is directly accessed by the processing unit. In secondary storage, the data is transferred to the main memory and then routed to the processing unit.
Main memory is volatile, which means the information stored in the memory would be erased when the computer is turned off. Secondary storage is non-volatile, which means the information stored in the memory is not erased when the computer is turned off.
Main memory has a limited storage capacity. Secondary storage can store bulk amount of data in a single unit.
Main memory devices are more expensive when compared to the secondary storage devices. Secondary storage devices are less expensive when compared to the main memory devices.

The examples of main memory are,

RAM

ROM

EPROM

PROM

Cache memory

Registers.

The examples of secondary storage are,

Floppy Disks

Magnetic tapes

Optical Disc

Flash memory.

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Chapter 1.7, Problem 1.33CP

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Chapter 1 Solutions

Starting Out with C++ from Control Structures to Objects, Student Value Edition (9th Edition)

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Main Memory	Secondary storage
In Main memory or Random Access Memory (RAM), the data is directly accessed by the processing unit.	In secondary storage, the data is transferred to the main memory and then routed to the processing unit.
Main memory is volatile, which means the information stored in the memory would be erased when the computer is turned off.	Secondary storage is non-volatile, which means the information stored in the memory is not erased when the computer is turned off.
Main memory has a limited storage capacity.	Secondary storage can store bulk amount of data in a single unit.
Main memory devices are more expensive when compared to the secondary storage devices.	Secondary storage devices are less expensive when compared to the main memory devices.
The examples of main memory are, RAM ROM EPROM PROM Cache memory Registers.	The examples of secondary storage are, Floppy Disks Magnetic tapes Optical Disc Flash memory.